Update README.md

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@ -9,6 +9,11 @@ see [REST API](REST.md)

 Server needs Grafana's API key (http://<your_grafana_url>/org/apikeys) to query data from Grafana datasources.

+API key role can be any of:
+- Viewer
+- Editor
+- Admin
+
 ### Docker installation

 Example of running hastic-server in Docker: