Add a changelog to the repo

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](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+
+## [Unreleased]
+### Changed
+- Hold Sideband PHY RESET low on older Cynthions
+- Bumped USB API to 1.1
+### Fixed
+- fix `fpga_requesting_port()` glitch
+- Correct Base32 representation of serial number
+
+
+## [1.0.2] - 2024-05-22
+### Changed
+- firmware.fpga_adv: replace UART reception with edge counter
+
+
+## [1.0.1] - 2024-05-21
+### Fixed
+- Fix handing off USB port to Apollo under Windows
+- Allow FPGA USB by default
+
+
+## [1.0.0] - 2024-05-18
+### Added
+- Initial release
+
+
+[Unreleased]: https://github.com/greatscottgadgets/apollo/compare/v1.0.2...HEAD
+[1.0.2]: https://github.com/greatscottgadgets/apollo/compare/v1.0.1...v1.0.2
+[1.0.1]: https://github.com/greatscottgadgets/apollo/compare/v1.0.0...v1.0.1
+[1.0.0]: https://github.com/greatscottgadgets/apollo/releases/tag/v1.0.0