Update CHANGELOG.md

Author: ericsizemore

CHANGELOG.md

@@ -8,17 +8,33 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+This intial version is forked from [rregeer/phpunit-coverage-check](https://github.com/richardregeer/phpunit-coverage-check/) by [Richard Regeer](https://github.com/richardregeer). This is the CHANGELOG for changes in comparison to the original library.
+
 ### Added
 
-  * 
+  * Created `backward-compatibility.md` for the Backward Compatibility Promise.
+  * Created `CHANGELOG.md` to keep track of changes.
+  * Created `SECURITY.md` for the security policy.
+  * Created testing and analysis workflows based on GitHub actions.
+  * Unit testing via PHPUnit.
+  * `box.json` that is used for generating Phar files for the library.
+    * Phar file will be added to each new release.
+  * Dev dependencies for PHPStan (and strict rules, bleeding edge, Symfony plugins) and PHPCS-Fixer.
+  * Dependency scanning via Renovate.
+  * `Symfony\Console` is now a runtime dependency.
+  * Library is now namespace'd to `Esi\CoverageCheck`.
 
 ### Changed
 
-  * 
+  * Reformatted composer.json, added more information/sections.
+  * Minimum PHP version bumped to 8.1.
+  * `coverage-check` (instead of coverage-check.php) in the root directory, which is the bin file.
+  * Updated `README.md` with more information, and changes to the usage of this library.
+  * This library is now a `Symfony\Console` application.
 
 ### Removed
 
-  * 
+  * `coverage-check.php`, `bin/coverage-check`, and `test/run` removed.
 
 
 [Unreleased]: https://github.com/ericsizemore/phpunit-coverage-check/master