Readme: added screenshot

Author: f3l1x

.docs/assets/console.png

@@ -10,6 +10,8 @@ Ultra easy-to-use [`Symfony\Console`](https://github.com/symfony/console) implem
 [![Latest stable](https://img.shields.io/packagist/v/contributte/console.svg?style=flat-square)](https://packagist.org/packages/contributte/console)
 [![PHPStan](https://img.shields.io/badge/PHPStan-enabled-brightgreen.svg?style=flat-square)](https://github.com/phpstan/phpstan)
 
+![](https://github.com/contributte/console/blob/master/.docs/assets/console.png "Console")
+
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