Add CHANGELOG file

Author: xymbol

CHANGELOG.md

@@ -0,0 +1,5 @@
+## [Unreleased]
+
+## [0.1.0] - 2025-01-26
+
+- Initial release

turbopuffer.gemspec

@@ -15,6 +15,8 @@ Gem::Specification.new do |spec|
   spec.required_ruby_version = ">= 3.3.6"
 
   spec.metadata["homepage_uri"] = spec.homepage
+  spec.metadata["source_code_uri"] = spec.homepage
+  spec.metadata["changelog_uri"] = "#{spec.homepage}/blob/main/CHANGELOG.md"
 
   # Specify which files should be added to the gem when it is released.
   # The `git ls-files -z` loads the files in the RubyGem that have been added into git.