Added KES grafana dashboard

Signed-off-by: Shubhendu Ram Tripathi <shubhendu@minio.io>

docs/metrics/prometheus/grafana/README.md

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+# How to monitor KES server with Grafana [![Slack](https://slack.min.io/slack?type=svg)](https://slack.min.io)
+
+[Grafana](https://grafana.com/) allows you to query, visualize, alert on and understand your metrics no matter where they are stored. Create, explore, and share dashboards with your team and foster a data driven culture.
+
+## Prerequisites
+
+- Prometheus and KES configured as explained in [document here](https://github.com/minio/kes/wiki/Monitoring).
+- Grafana installed as explained [here](https://grafana.com/grafana/download).
+
+## KES Grafana Dashboard
+
+Visualize KES metrics with the dashboard [json file here](https://raw.githubusercontent.com/minio/kes/master/docs/metrics/prometheus/grafana/kes-dashboard.json).
+
+![Grafana](https://raw.githubusercontent.com/minio/minio/master/docs/metrics/prometheus/grafana/grafana-kes.png)
+