Created [WIP] Prometheus Integration (markdown)

[WIP]-Prometheus-Integration.md

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+# Passing metrics to other platforms
+
+If you already use [Prometheus.io](https://prometheus.io) or a platform that supports Prometheus exporter format, you can get the metrics about each monitoring target from `http://<your.installation>:<your_port>/metrics`.
+
+Labels to filter by include:
+
+| Label Name | Description |
++------------+-------------+
+|monitor_name| The "Friendly Name" of the monitor |
+|monitor_type| The type (HTTP, keyword, TCP) of monitoring check |
+|monitor_url | The URL to be monitored (HTTP, keyword)
+|monitor_hostname | The Hostname to be monitored (TCP) |
+|monitor_port | The port to be monitored (TCP) |
+
+## Example PromQL queries
+
+Assuming we have HTTP monitors in place for bbc.co.uk and google.com:
+
+```
+# Show all response rates gouped by site
+sum(monitor_response_time) by (monitor_name)
+# Show only the response time for BBC.co.uk
+sum(monitor_reponse_time{monitor_url="https://www.bbc.co.uk/"})
+# Show the current status of Google.com
+monitor_status{monitor_name="Google"}
+```