Add changelog.md

Author: javorszky

CHANGELOG.md

@@ -0,0 +1,9 @@
+# Change Log
+All notable changes to this project will be documented in this file.
+This project adheres to [Semantic Versioning](http://semver.org/).
+
+## [0.1.0] - 2017-12-05
+### Added
+- Initial release to GitHub.
+
+[0.1.0]: https://github.com/php-composter/php-composter-phpcs-psr2/compare/v0.0.0...v0.1.0