add general changelog

CHANGELOG.md

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+# 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
+ 
+## [0.9.1] - 2020-06-02
+
+### Added
+
+- form field options
+- form field rating settings
+- form field logic jump settings
+
+### Changed
+
+- improved documentation
+- Installation Metrics
+
+### Fixed
+
+- anonymous submission of forms