Added license shield

README.md

@@ -1,6 +1,8 @@
 # ![Coriolis Web](/src/components/atoms/Logo/images/coriolis-small-black.svg)
 
-*Web  GUI for [coriolis](https://github.com/cloudbase/coriolis)*
+Web  GUI for [coriolis](https://github.com/cloudbase/coriolis)
+
+[![License: AGPL v3](https://img.shields.io/badge/License-AGPL%20v3-blue.svg)](https://www.gnu.org/licenses/agpl-3.0)
    
 ### Install instructions
 - [node](https://nodejs.org/en/download/package-manager/) >=6.x and [yarn](https://yarnpkg.com/lang/en/docs/install/) are required