Add auto tests, lower swift tool version to 5.10.0, update README (#16)

* feat: keep up with ts-fsrs, update algorithm version to 5.0

- Delete original source file
- Implemented FSRS 5.0
- Add tests

* feat: add github actions auto tests

- Create README.md
- convert code tests coverage report to lcov
- add codecov report
- lower the package build tool version to 5.10.0

.github/workflows/swift.yml

@@ -0,0 +1,44 @@
+# This workflow will build a Swift project
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-swift
+
+name: Swift
+
+on:
+  push:
+    branches: [ "main" ]
+    paths-ignore:
+      # - '.github/**'
+      - ".gitignore"
+      - "LICENSE"
+      - "README.md"
+  pull_request:
+    branches: [ "main" ]
+    paths-ignore:
+      # - '.github/**'
+      - ".gitignore"
+      - "LICENSE"
+      - "README.md"
+jobs:
+  build:
+
+    runs-on: macos-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Build
+      run: swift build -v
+    - name: Run tests
+      run: swift test -v --enable-code-coverage
+
+    - name: Test coverage
+      uses: ningkaiqiang/spm-lcov-action@master
+      with:
+          output-file: ./coverage/lcov.info
+
+    - uses: codecov/codecov-action@v1
+      with:
+        token: ${{ secrets.CODECOV_TOKEN }}
+        file: ./coverage/lcov.info
+        flags: unittests
+        name: codecov-umbrella
+        fail_ci_if_error: true

Package.swift

@@ -1,4 +1,4 @@
-// swift-tools-version: 6.0
+// swift-tools-version: 5.10.0
 // The swift-tools-version declares the minimum version of Swift required to build this package.
 
 import PackageDescription

README.md

@@ -0,0 +1,3 @@
+A Swift implementation of FSRS5.0
+
+[![codecov](https://codecov.io/gh/ningkaiqiang/swift-fsrs/graph/badge.svg?token=DQSJTROPFG)](https://codecov.io/gh/ningkaiqiang/swift-fsrs)