Add Changelog

CHANGELOG.md

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+# Changelog
+All notable changes to this package will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+## 0.0.2 - 2021-08-13
+### Added
+- Update SimplygonMeshSimplifier to support Simplygon9 (requires USD 2.0.0-exp.1 package version)
+
+### Fixed
+- Fixed WorkingMesh name length termination
+- Fixed GetTriangleRange not respecting subMeshCount
+- Fixed missing MeshFilter causing Unity editor window updates to stall
+
+### Changed
+- Removed MeshDecimator simplifier since the project has been archived
+
+## 0.0.1
+- First internal build.
+
+#Contributors
+- Amir Ebrahimi
+- Elliot Cuzzillo
+- Yuangguang Liao