Update README.md

README.md

@@ -109,3 +109,20 @@ DownloadUtil mUtil;
 ![例子图](https://github.com/AriaLyy/DownloadUtil/blob/master/img/11.gif "")
 
 #下载
+
+License
+-------
+
+    Copyright 2016 AriaLyy
+
+    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.