Add Changelog

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]
+- Data Transfer Object classes generation from swagger spec
+
+## [0.0.1] - 2020-03-24
+### Added
+- FastRoute Dispatcher generation from swagger operationIds
+
+[Unreleased]: https://github.com/olivierlacan/keep-a-changelog/compare/v1.0.0...HEAD
+[0.0.1]: https://github.com/olivierlacan/keep-a-changelog/releases/tag/v0.0.1