Create CHANGELOG.md

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/spec/v2.0.0.html).
+
+<!--
+The rules for this file:
+  * entries are sorted newest-first.
+  * summarize sets of changes - don't reproduce every git log comment here.
+  * don't ever delete anything.
+  * keep the format consistent:
+    * do not use tabs but use spaces for formatting
+    * 79 char width
+    * YYYY-MM-DD date format (following ISO 8601)
+  * accompany each entry with github issue/PR number (Issue #xyz)
+-->
+
+## [Unreleased]
+
+### Authors
+<!-- GitHub usernames of contributors to this release -->
+
+### Added
+<!-- New added features -->
+
+### Fixed
+<!-- Bug fixes -->
+
+### Changed
+<!-- Changes in existing functionality -->
+
+### Deprecated
+<!-- Soon-to-be removed features -->
+
+### Removed
+<!-- Removed features -->