Added CHANGELOG.md

Based on https://keepachangelog.com/

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).
+
+## [Unreleased]
+
+## [0.1.0] - 2021-12-16
+### Added
+- Added an example invocation of the router in `index.php`.
+- Added three example views for the main page, a form submission and a 404 page.
+- Added a `.htaccess` file which redirects all requests back to `index.php`.
+- Set up `composer.json` for the use with [Composer](https://getcomposer.org/) and [Packagist](https://packagist.org/).
+- Added [phpstan](https://packagist.org/packages/phpstan/phpstan) for code analysis.
+- Added extensive `README.md`.
+- Added notes on Contributing.
+- Added this changelog.
+
+[Unreleased]: https://github.com/Digital-Media/fhooe-router-skeleton/compare/v0.1.0...HEAD
+[0.1.0]: https://github.com/Digital-Media/fhooe-router-skeleton/releases/tag/v0.1.0