Add dashboard and Readme

Author: ThomasThelen

README.md

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+# GraphDB Grafana Dashboard
+
+Grafana dashboard for GraphDB
+
+## Background
+
+Ontotext provides a Grafana dashboard for Enterprise users, but doesn't provide a dashboard for the free version. This repository contains a dashboard that scrapes data from Prometheus, which is in turn scraping data from GraphDB's metrics endpoint (you need Prometheus for this).
+
+## Dashboard
+
+The dashboard exposes *most* of the metrics that GraphDB provides. This is limited to system level metrics such as space constraints, memory, and heap usage.
+
+![Grafana Dashboard](./images/dashboard.png "Grafana Dashboard")