Update real_world README

Author: draincoder

examples/real_world/README.md

@@ -11,4 +11,6 @@ docker compose -f examples/real_world/docker-compose.yaml --profile api --profil
 ```
 
 #### `Grafana:` http://127.0.0.1:3000/
+- **default** username: `admin`
+- **default** password: `admin`
 #### `Swagger:` http://127.0.0.1:8080/docs/