add changelog

Author: newAM

CHANGELOG.md

@@ -0,0 +1,20 @@
+# 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 [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+### Changed
+- Crate ownership changed from [tweedegolf] to [stm32-rs].
+  - Thank you [tweedegolf] for the initial development effort!
+- Sweeping changes throughout the entire crate, nothing is the same.
+
+## [0.1.0] - 2021-03-26
+- Initial release by [tweedegolf]
+
+[tweedegolf]: https://github.com/tweedegolf
+[stm32-rs]: https://github.com/stm32-rs
+
+[Unreleased]: https://github.com/stm32-rs/stm32wlxx-hal
+[0.1.0]: https://github.com/tweedegolf/stm32wlxx-hal