Add CHANGELOG

Author: k0ekk0ek

CHANGELOG.md

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+# Changelog
+
+All notable changes to simdzone will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+
+- Initial release.