Added 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).
+
+## [Unreleased]
+### Changed
+- 
+
+## [1.0.1] - 2021-02-05
+
+- Tested and approved for Moodle 3.9 and 3.10
+
+### Changed
+
+- Continuous integration with github workflows
+- Minor fixes to comply with moodle style requirements
+
+## [1.0.0] - 2019-07-30
+
+First version considered ready for field trial.
+
+[Unreleased]: https://github.com/KQMATH/moodle-mod_jazzquiz/compare/v0.4.1...HEAD
+[1.0.1]: https://github.com/KQMATH/moodle-qtype_mod_jazzquiz/compare/v1.0.0...v1.0.1