fix: Add a CHANGELOG.md (#64)

path/to/CHANGELOG.md

@@ -0,0 +1,19 @@
+# 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]
+
+- Initial release.
+
+## [v0.1.0] - 2023-10-01
+
+- First public release.
+- Basic functionality implemented.
+- Documentation updated.
+
+[Unreleased]: https://github.com/your-org/your-repo/compare/v0.1.0...HEAD
+[v0.1.0]: https://github.com/your-org/your-repo/releases/tag/v0.1.0

path/to/CONTRIBUTING.md

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+# Contributing
+
+We welcome contributions from the community! Please follow these guidelines when submitting changes.
+
+## Updating the Changelog
+
+- **Before merging**: Ensure the `CHANGELOG.md` is updated for the new release.
+- **Format**: Follow the [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) format.
+- **Content**: Include a new section for the upcoming release under `[Unreleased]`, and add entries for each change in previous releases.
+- **Links**: Add GitHub release URLs for each tagged version.
+
+Example:
+```markdown
+## [Unreleased]
+
+- Add new feature X.
+- Fix bug Y.
+
+## [v1.0.0] - 2023-10-01
+
+- Initial release.
+- Basic functionality implemented.
+```
+
+## Pull Requests
+
+- Open a pull request against the `main` branch.
+- Include tests for new features or bug fixes.
+- Reference relevant issues using `#issue-number`.