Added badges

Author: marc-mabe

README.md

@@ -1,4 +1,8 @@
 # PHPStan extension for php-enum
+[![Build Status](https://github.com/marc-mabe/php-enum-phpstan/workflows/Test/badge.svg?branch=master)](https://github.com/marc-mabe/php-enum-phpstan/actions?query=workflow%3ATest%20branch%3Amaster)
+[![Code Coverage](https://codecov.io/github/marc-mabe/php-enum-phpstan/coverage.svg?branch=master)](https://codecov.io/gh/marc-mabe/php-enum-phpstan/branch/master/)
+[![License](https://poser.pugx.org/marc-mabe/php-enum-phpstan/license)](https://github.com/marc-mabe/php-enum-phpstan/blob/master/LICENSE.txt)
+[![Latest Stable](https://poser.pugx.org/marc-mabe/php-enum-phpstan/v/stable.png)](https://packagist.org/packages/marc-mabe/php-enum-phpstan)
 
 [PHP-Enum](https://github.com/marc-mabe/php-enum) enumerations with native PHP.