Create .gemspec

Gemfile

@@ -1,14 +1,12 @@
 # frozen_string_literal: true
 source 'https://rubygems.org'
-ruby '~> 3.3', engine: 'ruby', engine_version: '~> 3.3'
-
-gem 'rake-compiler', '~> 1.2.0'
-gem 'json', '~> 2.7'
+gemspec
+ruby '~> 3.3.0', engine: 'ruby', engine_version: '~> 3.3.0'
 
 # Development Apps
 group :development do
   group :type_check do
-    gem 'rbs', '~> 3.4.2', require: false
+    gem 'rbs', '~> 3.4.4', require: false
     gem 'steep', '~> 1.6.0', require: false
   end
   group :documentation do

godot_rb.gemspec

@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+require_relative 'lib/godot_rb/version'
+
+Gem::Specification.new do |spec|
+  spec.name = 'Godot.rb'
+  spec.summary = 'CRuby in Godot Engine; see Homepage/README'
+  spec.version = Godot::VERSION
+  spec.author = 'ParadoxV5'
+  spec.license = 'Apache-2.0'
+
+  github_account = spec.author
+  github = "https://github.com/#{github_account}/#{spec.name}"
+  spec.metadata = {
+    'homepage_uri'      => spec.homepage = github,
+    'changelog_uri'     => File.join(github, 'releases'),
+    'bug_tracker_uri'   => File.join(github, 'issues'),
+    'funding_uri'       => "https://github.com/sponsors/#{github_account}",
+    'documentation_uri' => "https://rubydoc.info/gems/#{spec.name}"
+  }
+
+  spec.files = Dir['**/*']
+
+  spec.required_ruby_version = '~> 3.3.0'
+  spec.add_runtime_dependency 'json', '~> 2.7'
+  spec.add_development_dependency 'rake-compiler', '~> 1.2.0'
+  if RUBY_PLATFORM.eql? 'x64-mingw-ucrt'
+    spec.add_development_dependency 'mingw-make', '~> 1.0'
+  end
+  spec.requirements.push(
+    'CRuby (not JRuby, etc.)',
+    'Godot Engine ~> 4.2'
+  )
+end