adding changelog ready for initial release

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]
+
+## [1.0.0] - 2024-08-24
+
+- Initial Release
+
+[unreleased]: https://github.com/joe-mccarthy/harlow-bindicator/compare/1.0.0...HEAD
+[1.0.0]: https://github.com/joe-mccarthy/harlow-bindicator/releases/tag/1.0.0