Validator dashboard and some instructions (#996)

* Validator dashboard and some instructions

* Added a note

* Add newline

tools/grafana/README.md

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+# Grafana Dashboards
+
+NOTE: the dashboards here are not synced to our internal grafana and will need to manually be
+updated when we want to update our published templates.
+
+## Importing
+
+1. replace all instances of `<prometheus>` with your prometheus deployment name in grafana
+2. Create a new dashboard in grafana
+3. Select the gear icon "dashboard settings"
+4. Select "JSON Model"
+5. Copy/paste from the "\*.json" file
+
+## Exporting
+
+1. Open a dashboard
+2. Select the gear icon "dashboard settings"
+3. Select "JSON Model"
+4. Copy/paste to a "\*.json" file
+5. Remove `deployment`, `context`, and any other variables which are specific to our internal use
+6. Rename `grafanacloud-prom` to `<prometheus>`