add: changelog

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog] and this project adheres to [Semantic Versioning].
+
+Sections order is: `Fixed`, `Changed`, `Added`, `Deprecated`, `Removed`, `Security`.
+
+[keep a changelog]: http://keepachangelog.com/en/1.0.0/
+[semantic versioning]: http://semver.org/spec/v2.0.0.html
+
+---
+
+## [Unreleased]
+
+[unreleased]: https://github.com/metaist/castfit/compare/prod...main
+
+These are changes that are on `main` that are not yet in `prod`.
+
+---
+
+[0.1.0]: https://github.com/metaist/castfit/commits/0.1.0
+
+## [0.1.0] - 2023-12-15T12:12:04Z
+
+Initial release.