Add and update CHANGELOG

Author: mcduffie

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).
+
+## [0.2.0] - 2022-07-13
+
+### Added 
+
+- [#3](https://github.com/unity-sds/unity-app-generator/issues/3) - Automate MCP Gitlab Project Creation using Gitlab API
+- [#5](https://github.com/unity-sds/unity-app-generator/issues/5) - Integrate Dockstore API into unity-app-generator
+- [#6](https://github.com/unity-sds/unity-app-generator/issues/6) - Integrate Docker registry push into unity-app-generator
+- [#8](https://github.com/unity-sds/unity-app-generator/issues/8) - Modify unity-app-generator to create Dockstore.cwl that calls main workflow CWL
+- [#9](https://github.com/unity-sds/unity-app-generator/issues/9) - Add command line options to unity-app-generator to optionally push docker image into a registry
+- [#13](https://github.com/unity-sds/unity-app-generator/issues/13) - Modify build_ogc_app.py to break process into independent steps that can be run independently
+- [#16](https://github.com/unity-sds/unity-app-generator/issues/16) - Update unity-app-generator README for release
+
+### Fixed
+
+- [#2](https://github.com/unity-sds/unity-app-generator/issues/2) - Repo2Docker build error when attempting to generate application package