Add badges to README.md

Author: lkrms

README.md

@@ -3,6 +3,15 @@
 > A lightweight PHP toolkit for expressive backend/CLI apps. Opinionated but
 > adaptable. Negligible dependencies. May contain traces of Laravel.
 
+<p>
+  <a href="https://packagist.org/packages/lkrms/util"><img src="https://poser.pugx.org/lkrms/util/v" alt="Latest Stable Version" /></a>
+  <a href="https://packagist.org/packages/lkrms/util"><img src="https://poser.pugx.org/lkrms/util/license" alt="License" /></a>
+  <a href="https://github.com/lkrms/php-util/actions"><img src="https://github.com/lkrms/php-util/actions/workflows/ci.yml/badge.svg" alt="CI Status" /></a>
+  <a href="https://codecov.io/gh/lkrms/php-util"><img src="https://codecov.io/gh/lkrms/php-util/graph/badge.svg?token=5Z8MBDXO7R" alt="Code Coverage" /></a>
+</p>
+
+----
+
 ## Installation
 
 Install the latest version with [Composer](https://getcomposer.org/):