Add license shield

Author: lukasmacko

LICENSE

@@ -1,4 +1,4 @@
-pache License
+                                 Apache License
                            Version 2.0, January 2004
                         http://www.apache.org/licenses/
 

README.md

@@ -1,6 +1,8 @@
 [![Build Status](https://travis-ci.org/sysrepo/sysrepo.svg)](https://travis-ci.org/sysrepo/sysrepo)
 [![codecov.io](https://codecov.io/github/sysrepo/sysrepo/coverage.svg?branch=master)](https://codecov.io/github/sysrepo/sysrepo?branch=master)
 
+[![GitHub license](https://img.shields.io/github/license/sysrepo/sysrepo.svg)](https://github.com/sysrepo/sysrepo/blob/master/LICENSE)
+
 ## Status
 - Dec 2015: working on the first milestone - internal infrastructure, get-config functionality