Update README.md

Author: fengandyun

README.md

@@ -36,3 +36,19 @@
 | 《数据驱动：从方法到实践》 | 《Android 全埋点解决方案》 | 《iOS 全埋点解决方案》
 | ------ | ------ | ------ |
 | [![《数据驱动：从方法到实践》](https://opensource.sensorsdata.cn/wp-content/uploads/data_driven_book_1.jpg)](https://item.jd.com/12322322.html) | [![《Android 全埋点解决方案》](https://opensource.sensorsdata.cn/wp-content/uploads/Android-全埋点thumbnail_1.png)](https://item.jd.com/12574672.html) | ![《iOS 全埋点解决方案》](https://opensource.sensorsdata.cn/wp-content/uploads/iOS-全埋点thumbnail_1.png)
+
+## License
+
+Copyright 2015－2020 Sensors Data Inc.
+
+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.