added mirrord command

Author: wlanboy

README.md

@@ -28,6 +28,10 @@ Showing http status, response, timing and istio envy settings.
 curl -L -X POST 'http://127.0.0.1:8080/client' -H 'Content-Type: application/json' \
 -d '{"url" : "https://github.com", "copyHeaders": "false"}'
 ```
+# local dev
+```bash
+mirrord exec -n javahttpclient --target deployment/javahttpclient -- ./mvnw spring-boot:run
+```
 
 # swagger uri
 - http://localhost:8080/swagger-ui/index.html#/http-client-controller/postMapping