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/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+
+### Changed
+
+### Deprecated
+
+### Removed
+
+### Fixed
+
+### Security
+
+## [0.1.0] - 2024-01-14
+
+### Added
+
+- General project structure, including [common type definitions](./common/types.go)
+- Go programs for [client](./tui/main.go) and [server](./server/main.go)
+- GitHub Actions release flow, including binaries
+
+## Links
+
+[unreleased]: https://github.com/supleed2/omg-rs/compare/v0.1.0...HEAD
+[0.1.0]: https://github.com/supleed2/omg-rs/releases/tag/v0.1.0