Add changelog to project with initial release

Author: dempseyatgithub

CHANGELOG.md

@@ -0,0 +1,24 @@
+# CHANGELOG
+
+<!--
+Add new items at the end of the relevant section under **Unreleased**.
+-->
+
+## [Unreleased]
+
+*No new changes.*
+
+---
+
+## [0.1.0] - 2024-07-22
+
+- `swift-evolution-metadata-extractor` initial release.
+
+---
+
+This changelog's format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
+
+<!-- Link references for releases -->
+
+[Unreleased]: https://github.com/swiftlang/swift-evolution-metadata-extractor/compare/0.1.0...HEAD
+[0.1.0]: https://github.com/swiftlang/swift-evolution-metadata-extractor/releases/tag/0.1.0