add changelog

CHANGELOG.md

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+# Change Log
+All notable changes to the ClimateSetEmulator repo will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/)
+and this project adheres to [Semantic Versioning](http://semver.org/).
+
+
+## [Unreleased] - yyyy-mm-dd
+
+Here is a summary of the changes that are currently happening (PRs).
+
+### Added
+- [Changelog](https://github.com/RolnickLab/ClimateSet/pull/20)
+
+### Changed
+- [First-level Cleanup](https://github.com/RolnickLab/ClimateSet/pull/20)
+
+### Fixed
+
+
+## [0.1.0] - 2024-08-13
+
+First tagged version of the code base.
+
+### Added
+- [LICENSE](https://github.com/RolnickLab/ClimateSet/blob/main/LICENSE)
+
+### Changed
+
+### Fixed