Add sample codes for elixir client

samples/client/petstore/elixir/.swagger-codegen-ignore

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+# Swagger Codegen Ignore
+# Generated by swagger-codegen https://github.com/swagger-api/swagger-codegen
+
+# Use this file to prevent files from being overwritten by the generator.
+# The patterns follow closely to .gitignore or .dockerignore.
+
+# As an example, the C# client generator defines ApiClient.cs.
+# You can make changes and tell Swagger Codgen to ignore just this file by uncommenting the following line:
+#ApiClient.cs
+
+# You can match any string of characters against a directory, file or extension with a single asterisk (*):
+#foo/*/qux
+# The above matches foo/bar/qux and foo/baz/qux, but not foo/bar/baz/qux
+
+# You can recursively match patterns against a directory, file or extension with a double asterisk (**):
+#foo/**/qux
+# This matches foo/bar/qux, foo/baz/qux, and foo/bar/baz/qux
+
+# You can also negate patterns with an exclamation (!).
+# For example, you can ignore all files in a docs folder with the file extension .md:
+#docs/*.md
+# Then explicitly reverse the ignore rule for a single file:
+#!docs/README.md

samples/client/petstore/elixir/README.md

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+# SwaggerPetstore
+
+**TODO: Add description**
+
+## Installation
+
+If [available in Hex](https://hex.pm/docs/publish), the package can be installed
+by adding `swagger_petstore` to your list of dependencies in `mix.exs`:
+
+```elixir
+def deps do
+  [{:swagger_petstore, "~> 0.1.0"}]
+end
+```
+
+Documentation can be generated with [ExDoc](https://github.com/elixir-lang/ex_doc)
+and published on [HexDocs](https://hexdocs.pm). Once published, the docs can
+be found at [https://hexdocs.pm/swagger_petstore](https://hexdocs.pm/swagger_petstore).

samples/client/petstore/elixir/config/config.exs

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+# This file is responsible for configuring your application
+# and its dependencies with the aid of the Mix.Config module.
+use Mix.Config
+
+# This configuration is loaded before any dependency and is restricted
+# to this project. If another project depends on this project, this
+# file won't be loaded nor affect the parent project. For this reason,
+# if you want to provide default values for your application for
+# 3rd-party users, it should be done in your "mix.exs" file.
+
+# You can configure for your application as:
+#
+#     config :swagger_petstore, key: :value
+#
+# And access this configuration in your application as:
+#
+#     Application.get_env(:swagger_petstore, :key)
+#
+# Or configure a 3rd-party app:
+#
+#     config :logger, level: :info
+#
+
+# It is also possible to import configuration files, relative to this
+# directory. For example, you can emulate configuration per environment
+# by uncommenting the line below and defining dev.exs, test.exs and such.
+# Configuration from the imported file will override the ones defined
+# here (which is why it is important to import them last).
+#
+#     import_config "#{Mix.env}.exs"

samples/client/petstore/elixir/lib/swagger_petstore/api/fake.ex

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+defmodule SwaggerPetstore.Api.Fake do
+  @moduledoc """
+  Documentation for SwaggerPetstore.Api.Fake.
+  """
+
+  use Tesla
+
+  plug Tesla.Middleware.BaseUrl, "http://petstore.swagger.io/v2"
+  plug Tesla.Middleware.JSON
+
+  def test_client_model(body) do
+    method = [method: :patch]
+    url = [url: "/fake"]
+    query_params = []
+    header_params = []
+    body_params = [body: body]
+    form_params = []
+    params = query_params ++ header_params ++ body_params ++ form_params
+    opts = []
+    options = method ++ url ++ params ++ opts
+
+    request(options)
+  end
+
+  def test_endpoint_parameters(number, double, pattern_without_delimiter, byte, integer, int32, int64, float, string, binary, date, date_time, password, callback) do
+    method = [method: :post]
+    url = [url: "/fake"]
+    query_params = []
+    header_params = []
+    body_params = []
+    form_params = [body: Enum.map_join([{:"integer", integer}, {:"int32", int32}, {:"int64", int64}, {:"number", number}, {:"float", float}, {:"double", double}, {:"string", string}, {:"patternWithoutDelimiter", pattern_without_delimiter}, {:"byte", byte}, {:"binary", binary}, {:"date", date}, {:"dateTime", date_time}, {:"password", password}, {:"callback", callback}], "&", &("#{elem(&1, 0)}=#{elem(&1, 1)}"))]
+    params = query_params ++ header_params ++ body_params ++ form_params
+    opts = []
+    options = method ++ url ++ params ++ opts
+
+    request(options)
+  end
+
+  def test_enum_parameters(enum_form_string_array, enum_form_string, enum_header_string_array, enum_header_string, enum_query_string_array, enum_query_string, enum_query_integer, enum_query_double) do
+    method = [method: :get]
+    url = [url: "/fake"]
+    query_params = [query: [{:"enumQueryStringArray", enum_query_string_array}, {:"enumQueryString", enum_query_string}, {:"enumQueryInteger", enum_query_integer}]]
+    header_params = [header: [{:"enumHeaderStringArray", enum_header_string_array}, {:"enumHeaderString", enum_header_string}]]
+    body_params = []
+    form_params = [body: Enum.map_join([{:"enumFormStringArray", enum_form_string_array}, {:"enumFormString", enum_form_string}, {:"enumQueryDouble", enum_query_double}], "&", &("#{elem(&1, 0)}=#{elem(&1, 1)}"))]
+    params = query_params ++ header_params ++ body_params ++ form_params
+    opts = []
+    options = method ++ url ++ params ++ opts
+
+    request(options)
+  end
+end

samples/client/petstore/elixir/lib/swagger_petstore/api/pet.ex

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+defmodule SwaggerPetstore.Api.Pet do
+  @moduledoc """
+  Documentation for SwaggerPetstore.Api.Pet.
+  """
+
+  use Tesla
+
+  plug Tesla.Middleware.BaseUrl, "http://petstore.swagger.io/v2"
+  plug Tesla.Middleware.JSON
+
+  def add_pet(body) do
+    method = [method: :post]
+    url = [url: "/pet"]
+    query_params = []
+    header_params = []
+    body_params = [body: body]
+    form_params = []
+    params = query_params ++ header_params ++ body_params ++ form_params
+    opts = []
+    options = method ++ url ++ params ++ opts
+
+    request(options)
+  end
+
+  def delete_pet(pet_id, api_key) do
+    method = [method: :delete]
+    url = [url: "/pet/#{pet_id}"]
+    query_params = []
+    header_params = [header: [{:"apiKey", api_key}]]
+    body_params = []
+    form_params = []
+    params = query_params ++ header_params ++ body_params ++ form_params
+    opts = []
+    options = method ++ url ++ params ++ opts
+
+    request(options)
+  end
+
+  def find_pets_by_status(status) do
+    method = [method: :get]
+    url = [url: "/pet/findByStatus"]
+    query_params = [query: [{:"status", status}]]
+    header_params = []
+    body_params = []
+    form_params = []
+    params = query_params ++ header_params ++ body_params ++ form_params
+    opts = []
+    options = method ++ url ++ params ++ opts
+
+    request(options)
+  end
+
+  def find_pets_by_tags(tags) do
+    method = [method: :get]
+    url = [url: "/pet/findByTags"]
+    query_params = [query: [{:"tags", tags}]]
+    header_params = []
+    body_params = []
+    form_params = []
+    params = query_params ++ header_params ++ body_params ++ form_params
+    opts = []
+    options = method ++ url ++ params ++ opts
+
+    request(options)
+  end
+
+  def get_pet_by_id(pet_id) do
+    method = [method: :get]
+    url = [url: "/pet/#{pet_id}"]
+    query_params = []
+    header_params = []
+    body_params = []
+    form_params = []
+    params = query_params ++ header_params ++ body_params ++ form_params
+    opts = []
+    options = method ++ url ++ params ++ opts
+
+    request(options)
+  end
+
+  def update_pet(body) do
+    method = [method: :put]
+    url = [url: "/pet"]
+    query_params = []
+    header_params = []
+    body_params = [body: body]
+    form_params = []
+    params = query_params ++ header_params ++ body_params ++ form_params
+    opts = []
+    options = method ++ url ++ params ++ opts
+
+    request(options)
+  end
+
+  def update_pet_with_form(pet_id, name, status) do
+    method = [method: :post]
+    url = [url: "/pet/#{pet_id}"]
+    query_params = []
+    header_params = []
+    body_params = []
+    form_params = [body: Enum.map_join([{:"name", name}, {:"status", status}], "&", &("#{elem(&1, 0)}=#{elem(&1, 1)}"))]
+    params = query_params ++ header_params ++ body_params ++ form_params
+    opts = []
+    options = method ++ url ++ params ++ opts
+
+    request(options)
+  end
+
+  def upload_file(pet_id, additional_metadata, file) do
+    method = [method: :post]
+    url = [url: "/pet/#{pet_id}/uploadImage"]
+    query_params = []
+    header_params = []
+    body_params = []
+    form_params = [body: Enum.map_join([{:"additionalMetadata", additional_metadata}, {:"file", file}], "&", &("#{elem(&1, 0)}=#{elem(&1, 1)}"))]
+    params = query_params ++ header_params ++ body_params ++ form_params
+    opts = []
+    options = method ++ url ++ params ++ opts
+
+    request(options)
+  end
+end

samples/client/petstore/elixir/lib/swagger_petstore/api/store.ex

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+defmodule SwaggerPetstore.Api.Store do
+  @moduledoc """
+  Documentation for SwaggerPetstore.Api.Store.
+  """
+
+  use Tesla
+
+  plug Tesla.Middleware.BaseUrl, "http://petstore.swagger.io/v2"
+  plug Tesla.Middleware.JSON
+
+  def delete_order(order_id) do
+    method = [method: :delete]
+    url = [url: "/store/order/#{order_id}"]
+    query_params = []
+    header_params = []
+    body_params = []
+    form_params = []
+    params = query_params ++ header_params ++ body_params ++ form_params
+    opts = []
+    options = method ++ url ++ params ++ opts
+
+    request(options)
+  end
+
+  def get_inventory() do
+    method = [method: :get]
+    url = [url: "/store/inventory"]
+    query_params = []
+    header_params = []
+    body_params = []
+    form_params = []
+    params = query_params ++ header_params ++ body_params ++ form_params
+    opts = []
+    options = method ++ url ++ params ++ opts
+
+    request(options)
+  end
+
+  def get_order_by_id(order_id) do
+    method = [method: :get]
+    url = [url: "/store/order/#{order_id}"]
+    query_params = []
+    header_params = []
+    body_params = []
+    form_params = []
+    params = query_params ++ header_params ++ body_params ++ form_params
+    opts = []
+    options = method ++ url ++ params ++ opts
+
+    request(options)
+  end
+
+  def place_order(body) do
+    method = [method: :post]
+    url = [url: "/store/order"]
+    query_params = []
+    header_params = []
+    body_params = [body: body]
+    form_params = []
+    params = query_params ++ header_params ++ body_params ++ form_params
+    opts = []
+    options = method ++ url ++ params ++ opts
+
+    request(options)
+  end
+end