docs: add CHANGELOG.md

Author: Mukller

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/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+- Future features and improvements will be listed here
+
+### Changed
+- Ongoing updates and modifications
+
+### Fixed
+- Bug fixes and corrections
+
+---
+
+## How to Update This Changelog
+
+When making changes, add an entry under `[Unreleased]` in the appropriate category:
+
+- **Added** – new features
+- **Changed** – changes to existing functionality
+- **Deprecated** – soon-to-be removed features
+- **Removed** – removed features
+- **Fixed** – bug fixes
+- **Security** – vulnerability fixes
+
+When releasing, change `[Unreleased]` to the version number and date,
+then add a new empty `[Unreleased]` section at the top.
+
+---
+*Documentation contributed by [Mukller](https://github.com/Mukller)*