Add License.

README.md

@@ -879,4 +879,21 @@ greenDAO是Android SQLite数据库ORM框架的一种。ORM即对象关系映射,
                 });
             }
         }
-    };
+    };
+
+# License #
+
+	QQDemo
+	Copyright (c) 2016 Leon Fan (https://github.com/uncleleonfan).
+
+	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.