[EH] add license badge

Author: tswonke

README.md

@@ -1,6 +1,7 @@
 # Provides basic API functionality for Laravel
 
 [![Latest Version on Packagist](https://img.shields.io/packagist/v/webfactor/laravel-apicontroller.svg?style=flat-square)](https://packagist.org/packages/webfactor/laravel-apicontroller)
+[![Software License](https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat-square)](LICENSE.md)
 [![StyleCI](https://styleci.io/repos/104893362/shield?branch=master)](https://styleci.io/repos/104893362)
 [![Total Downloads](https://img.shields.io/packagist/dt/webfactor/laravel-apicontroller.svg?style=flat-square)](https://packagist.org/packages/spatie/laravel-apicontroller)