Update README.md

Signed-off-by: yutao04 <[email protected]>

Author: trickMin

README.md

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+# Api Plane
+[![Hango gateway CI](https://github.com/hango-io/api-plane/actions/workflows/java_ci.yml/badge.svg)](https://github.com/hango-io/api-plane/actions/workflows/java_ci.yml)
+
+## About
+Generate Slime CRD and Istio CRD for gateway，include VirtualService, DestinationRule, EnvoyPlugin, etc...
+VirtualService and DestinationRule are Istio CRD, which is used to route.
+EnvoyPlugin and PluginManager are Slime CRD，which is used for plugin configuration.
+
+## Project structure
+```shell script
+.
+├── plugin
+└── hango-api-plane-server
+    ├── Dockerfile
+    ├── src
+    ├── setenv.sh
+    └── pom.xml 
+├── LICENSE
+├── README.md
+└── pom.xml
+
+````
+
+## Develop
+Using maven
+```shell script
+$ git clone [email protected]:hango-io/api-plane.git
+$ cd hango-api-plane-server
+$ mvn clean package
+```
+
+## Contributing
+If you wish to contribute to Hango API Gateway, please read the root projects' contributing files.
+
+## License
+[Apache-2.0](https://choosealicense.com/licenses/apache-2.0/)