Add CHANGELOG.md

Add CHANGELOG.md

diff --git a/CHANGELOG.md b/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]
+
+## [0.0.1]
+
+### Added
+* Rendering a Graphviz image using the `[graphviz]` BBCode tag
+* Support for selecting engine
+
+[Unreleased]: https://github.com/discourse/discourse-graphviz/compare/v0.0.1...HEAD
+[0.0.1]: https://github.com/discourse/discourse-graphviz/compare/1004f91812741205e94d2516f899720aba408a4b...0.0.1

GitHub sha: adb51e51

This commit appears in #8 which was merged by SamSaffron.