Adding seimple service to the demo setion

docs/getting-started-guides/coreos/bare_metal_offline.md

@@ -608,6 +608,23 @@ On the Kubernetes Master node lets create a '''nginx.yml'''
             image: dockerfile/nginx
     
 
+Now for the service: ```nginx-service.yml```
+    
+    kind: Service
+    apiVersion: v1beta1
+    # must be a DNS compatible name
+    id: nginx-example
+    # the port that this service should serve on
+    port: 80
+    # just like the selector in the replication controller,
+    # but this time it identifies the set of pods to load balance
+    # traffic to.
+    selector:
+      name: www
+    # the container on each pod to connect to, can be a name
+    # (e.g. 'www') or a number (e.g. 80)
+    containerPort: 80
+
 Now add the pod to Kubernetes:
 
      kubectl create -f nginx.yml