adding a changelog

CHANGELOG.md

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+# Changelog
+
+All changes that impact users of 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).
+
+<!---
+This document is intended for the users of astrolisp. Changes to things
+like tests should not be noted in this document.
+When updating this file for a PR, add an entry for your change under Unreleased
+and one of the following headings:
+
+ - 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.
+-->
+
+## Changes
+
+### Added
+**Date:** *Feb 24th, 2023*
+**Author:** *Anton Hibl*
+
+Added a changelog to help users keep track of changes more clearly.