chore: add gemspec uris

Author: mattkhan

jsonapi-resources-anchor.gemspec

@@ -6,8 +6,13 @@ Gem::Specification.new do |s|
   s.summary     = "jsonapi-resources type annotation, inference, and schema/docs generation"
   s.authors     = ["Matt"]
   s.license     = "MIT"
+  s.metadata = {
+    "changelog_uri" => "https://github.com/mattkhan/jsonapi-resources-anchor/blob/main/CHANGELOG.md",
+    "documentation_uri" => "https://anchor-gem.vercel.app/docs",
+    "source_code_uri" => "https://github.com/mattkhan/jsonapi-resources-anchor",
+  }
 
-  s.files       = Dir.glob("lib/**/*").reject { |f| File.directory?(f) }
+  s.files = Dir.glob("lib/**/*").reject { |f| File.directory?(f) }
 
   s.required_ruby_version = ">= 3.1"
   s.add_dependency("jsonapi-resources", "~> 0.1")