Add CHANGELOG

CHANGELOG

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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](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [0.02] - 2018-07-18
+### Fixed
+- negative time when the stopping starts
+- removed delay between the end of the startton an the begin of the stopping
+### Changed
+- slowed down animations
+### Added
+- animation for the text "click start to start" between STOPPED and IDLE to
+  prevent it from getting out of the screen
+  
+## [0.01]
+### Initial Release