add readme outlining how to edit and publish

grafana/README.md

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+# Grafana Publishing
+
+The page for publishing this dashboard is https://grafana.com/grafana/dashboards/13396
+
+## How to edit and Publish
+    - Start grafana locally (consul-docker-test/mesh-gateways-l7 will provide you two Consul DCs, grafana, and prometheus)_
+    - Import the dashboard json into a new dashboard
+    - Make changes
+    - Click "share" and export for external publishing
+    - Login to Grafana via the team account (message a manager)
+    - Publish as a new version, including change notes.