[DOC] Add changelog in preparation for v0.1.0

Author: f-dangel

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
+
+### Fixed
+
+## [0.1.0] - 2024-09-11
+
+Initial release.
+
+[unreleased]: https://github.com/f-dangel/wandb_preempt/compare/v0.1.0...HEAD
+[0.1.0]: https://github.com/f-dangel/wandb_preempt/compare/ef3d15cf1474c2b780acad60a722f46880d43c84...v0.1.0