add license in readme

readme.md

@@ -3,4 +3,9 @@
 Frontend application for [lesspass.com](https://lesspass.com)
 
 
-see [LessPass](https://github.com/lesspass/lesspass) project
+## License
+
+MIT © [Guillaume Vincent](http://guillaumevincent.com)
+
+
+## [LessPass project](https://github.com/lesspass/lesspass)