Add a CHANGELOG

CHANGELOG.md

@@ -0,0 +1,15 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Early Semantic Versioning](https://docs.scala-lang.org/overviews/core/binary-compatibility-for-library-authors.html#recommended-versioning-scheme) in addition to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.1.0] - 2022-08-03
+
+### Added
+
+- Begin keeping this [CHANGELOG](./CHANGELOG.md).
+- Initial release of this library using code extracted from [sbt-tpolecat](https://github.com/typelevel/sbt-tpolecat).
+
+[0.1.0]: https://github.com/typelevel/scalac-options/releases/tag/v0.1.0