added a changelog file

CHANGELOG.md

+# Change Log
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/)
+and this project adheres to [Semantic Versioning](http://semver.org/
+
+## [Unreleased]
+### Added
+
+### Changed
+
+### Fixed 
+
+- InjectCommand blocks if the system is down @aorlati
+
+
+## 
+
+