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).
+
+## [Unreleased]
+
+### Added
+
+- Semantic highlighting in [#29](https://github.com/aazuspan/spinasm-lsp/pull/29)
+
+### Fixed
+
+- Arg counting bug in signature help that displayed the incorrect current argument in [#25](https://github.com/aazuspan/spinasm-lsp/pull/25)
+- Inconsistent diagnostics that sometimes appeared on the line after the error in [#32](https://github.com/aazuspan/spinasm-lsp/pull/32)
+
+## [0.1.1] - 2024-08-15
+
+### Fixed
+
+- PyPI classifier metadata in [#22](https://github.com/aazuspan/spinasm-lsp/pull/22)
+
+## [0.1.0] - 2024-08-14
+
+### Added
+
+- Diagnostics
+- Signature help
+- Hover
+- Completion
+- Renaming
+- Go to definition
+
+[unreleased]: https://github.com/aazuspan/spinasm-lsp/compare/0.1.1...HEAD
+[0.1.1]: https://github.com/aazuspan/spinasm-lsp/compare/0.1.0...0.1.1
+[0.1.0]: https://github.com/aazuspan/spinasm-lsp/releases/tag/0.1.0