Created Prometheus Exporter (markdown)

Prometheus-Exporter.md

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+# Prometheus Exporter
+Statup includes a prometheus exporter so you can have even more monitoring power with your services. The prometheus exporter can be seen on `/metrics`, simply create another exporter in your prometheus config.
+
+```yaml
+scrape_configs:
+  - job_name: 'statup'
+    static_configs:
+      - targets: ['statup:8080']
+```
+
+### `/metrics` Output
+```
+statup_total_failures 206
+statup_total_services 4
+statup_service_failures{id="1" name="Google"} 0
+statup_service_latency{id="1" name="Google"} 12
+statup_service_online{id="1" name="Google"} 1
+statup_service_status_code{id="1" name="Google"} 200
+statup_service_response_length{id="1" name="Google"} 10777
+statup_service_failures{id="2" name="Statup.io"} 0
+statup_service_latency{id="2" name="Statup.io"} 3
+statup_service_online{id="2" name="Statup.io"} 1
+statup_service_status_code{id="2" name="Statup.io"} 200
+statup_service_response_length{id="2" name="Statup.io"} 2
+```