Add CHANGELOG.md

Author: slavcodev

CHANGELOG.md

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+# Change Log
+All notable changes to this project will be documented in this file
+using the [Keep a CHANGELOG](http://keepachangelog.com/) principles.
+
+<!--
+Types of changes
+
+Added - for new features.
+Changed - for changes in existing functionality.
+Deprecated - for soon-to-be removed features.
+Removed - for now removed features.
+Fixed - for any bug fixes.
+Security - in case of vulnerabilities.
+-->
+
+## [Unreleased]
+
+_TBD_
+
+## [0.1.0] 2021-03-19
+
+Initial release.