License added in readme

README.md

@@ -49,3 +49,19 @@ Use the Standard API for working with this notification library:
 - [x] [IE] Add support for event listeners
 - [ ] [IE] Implement actions as a thumbBar buttons
 - [ ] Add Support for Service Workers
+
+# LICENSE
+
+Copyright 2016 Tsvetan Tsvetkov
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+     http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.