update docs

README.md

@@ -3,6 +3,7 @@
 1) run the docker containers from Docker compose
 
 ```
+sudo chown -R 472:472 grafana-data/
 docker-compose up
 ```
 
@@ -19,3 +20,5 @@ http://localhost:3000
 User: admin
 Password: 1234
 
+Click on dashboards and Example Dash
+