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](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [1.1.1] - 2024-06-26
+
+### Added
+
+- Add changelog.
+
+### Changed
+
+- Remove Cynthion trademark from product string.
+
+
+## [1.1.0] - 2024-05-29
+
+### Fixed
+
+- Correct Base32 representation of serial number.
+
+
+## [1.0.0] - 2024-05-16
+
+### Added
+
+- Initial release.
+
+
+[1.1.1]: https://github.com/greatscottgadgets/saturn-v/compare/v1.1.0...v1.1.1
+[1.1.0]: https://github.com/greatscottgadgets/saturn-v/compare/v1.0.0...v1.1.0
+[1.0.0]: https://github.com/greatscottgadgets/saturn-v/releases/tag/v1.0.0