update readme.md

Author: applegreengrape

README.md

@@ -3,6 +3,23 @@ A simple wait and response api for retry& timeout test. Yes everyone loves to te
 
 Install via brew 
 ```
-brew tap applegreengrape/timeout-checker https://github.com/applegreengrape/timeout-checker
-brew install timeout-checker
-```
+$ brew tap applegreengrape/timeout-checker https://github.com/applegreengrape/timeout-checker
+$ brew install timeout-checker
+```
+server side:
+```
+$ checker-api -wait 5 -port 8081
+2021/11/19 16:37:06 recieved
+2021/11/19 16:37:11 returned
+2021/11/19 16:37:14 recieved
+2021/11/19 16:37:19 returned
+```
+
+client side:
+```
+$ curl http://localhost:8081/healthcheck
+{"status":"up"}
+
+$ curl http://localhost:8081/healthcheck
+{"status":"up"}
+```