Create CHANGELOG.md

CHANGELOG.md

+# 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]
+
+## [3.0.0] - to be released
+
+### Added
+- Dynamic labels for fact slots of a scroll
+- Hint feature: show hints for unfilled slots of a scroll
+- Added restart button
+
+### Changed
+- Performance increases of the MMT server
+- Made Unity UI slicker