Added license and goreportcard badge

Author: mxschmitt

README.md

@@ -1,4 +1,7 @@
-# Hetzner Cloud Docker machine driver 
+# Hetzner Cloud Docker machine driver
+
+[![Go Report Card](https://goreportcard.com/badge/github.com/JonasProgrammer/docker-machine-driver-hetzner)](https://goreportcard.com/report/github.com/JonasProgrammer/docker-machine-driver-hetzner)
+[![License](https://img.shields.io/badge/License-MIT-blue.svg)](https://opensource.org/licenses/MIT)
 
 > This library adds the support for creating [Docker machines](https://github.com/docker/machine) hosted on the [Hetzner Cloud](hetzner.de/cloud).