fix doc

README.md

@@ -49,6 +49,15 @@ To experience KubeInvaders in action, try it out in this free O'Reilly Katacoda
 
 KubeInvaders exposes metrics for Prometheus through the standard endpoint /metrics
 
+This is an example of Prometheus configuration
+
+```bash
+scrape_configs:
+- job_name: kubeinvaders
+  static_configs:
+  - targets:
+    - kubeinvaders.kubeinvaders.svc.cluster.local:8080
+````
 Example of metrics
 
 ```bash
@@ -66,6 +75,7 @@ deleted_pods_total 16
 # Total number of deleted pods
 deleted_namespace_pods_count{namespace=myawesomenamespace} 8
 ```
+
 ![Download Grafana dashboard](https://github.com/lucky-sideburn/KubeInvaders/blob/master/grafana/KubeInvadersDashboard.json)
 
 ![Alt Text](https://github.com/lucky-sideburn/KubeInvaders/blob/master/grafana2.png)