Update README.md

Author: yaoyue

README.md

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 <img src="https://ow-file.sensorsdata.cn/www/home/header/sensors_header_icon.svg" width="200" >
 
+[![License](https://img.shields.io/badge/license-Commercial-lightgrey)](https://github.com/sensorsdata/sensors_analytics_flutter_plugin/blob/master/LICENSE)
+[![Average time to resolve an issue](http://isitmaintained.com/badge/resolution/sensorsdata/sensors_analytics_flutter_plugin.svg)](http://isitmaintained.com/project/sensorsdata/sensors_analytics_flutter_plugin "Average time to resolve an issue")
+[![Percentage of issues still open](http://isitmaintained.com/badge/open/sensorsdata/sensors_analytics_flutter_plugin.svg)](http://isitmaintained.com/project/sensorsdata/sensors_analytics_flutter_plugin "Percentage of issues still open")
+[![GitHub release](https://img.shields.io/github/tag/sensorsdata/sensors_analytics_flutter_plugin.svg?label=release)](https://github.com/sensorsdata/sensors_analytics_flutter_plugin/releases)
+[![GitHub release date](https://img.shields.io/github/release-date/sensorsdata/sensors_analytics_flutter_plugin.svg)](https://github.com/sensorsdata/sensors_analytics_flutter_plugin/releases)
+![platform](https://img.shields.io/badge/platform-Android%20%7C%20iOS%20%7C%20Web%20%7C%20HarmonyOS-green)
+
+
 ## 神策简介
 
 [**神策数据**](https://www.sensorsdata.cn/)