Add CNS api examples for create and delete HNS networks (#337)

* Add examples for create and delete hns network APIs

examples/cns/create-hns-network.json

@@ -0,0 +1,10 @@
+{
+    "NetworkName": "hnsnw",
+    "NetworkType": "l2tunnel",
+    "Subnets": [
+        {
+            "AddressPrefix": "192.168.255.0/30",
+            "GatewayAddress": "192.168.255.1"
+        }
+    ]
+}

examples/cns/delete-hns-network.json

@@ -0,0 +1,3 @@
+{
+    "NetworkName": "hnsnw"
+}