docs: 📝 add a changelog.md

This Commit adds CHANGELOG.md to the root of the repository to keep a version history independent of the Git Hosting environment

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],
+and this project adheres to [Semantic Versioning].
+
+## [Unreleased]
+
+### Changed
+
+- Change executable name in the Docker image to `gitea-register-account-bot`
+
+### Security
+
+- Use non root user in the Docker image
+
+## [0.0.1] - 2024-01-10
+
+### Added
+
+- Added gitea account registration via !register
+
+<!-- Links -->
+[keep a changelog]: https://keepachangelog.com/en/1.0.0/
+[semantic versioning]: https://semver.org/spec/v2.0.0.html
+
+<!-- Versions -->
+[unreleased]: https://git.beisel.it/beisel.org/gitea-register-account-bot/compare/v0.0.1...HEAD
+[0.0.1]: https://git.beisel.it/beisel.org/gitea-register-account-bot/releases/tag/v0.0.1