docs for firewall command

Author: katzy687

resource-scripts/set_azure_mgmt_firewall/readme.MD

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+# Set Azure Virtual Appliance Routing Gateway
+A utility resource script to to construct and send the API request to Azure to set routing tables on Azure
+
+## Usage
+1. Add script as resource script
+2. Append resource script to desired firewall / switch model
+3. Add switch / firewall to sandbox, connect subnets across the firewall / virtual appliance
+4. Trigger the "set_azure_mgmt_firewall" command from setup
+5. Confirm that the request worked:
+   - that the routing table on Azure appears correct
+   - that traffic is flowing through virtual appliance (try traceroute)
+   - If issues, confirm that JSON request appears valid
+
+## Sample request JSON structure
+```json
+    {
+        "route_tables": [
+            {
+                "name": "myRouteTable1",
+                "subnets": [
+                    "subnetId1",
+                    "subnetId2"
+                ],
+                "routes": [
+                    {
+                        "name": "myRoute1",
+                        "address_prefix": "10.0.1.0/28",
+                        "next_hop_type": "VirtualAppliance",
+                        "next_hop_address": "10.0.1.15"
+                    }
+                ]
+            },
+            {
+                "name": "myRouteTable2",
+                "subnets": [
+                    "subnetId3",
+                    "subnetId4"
+                ],
+                "routes": [
+                    {
+                        "name": "myRoute2",
+                        "address_prefix": "10.0.1.0/28",
+                        "next_hop_type": "VirtualAppliance",
+                        "next_hop_address": "10.0.1.15"
+                    }
+                ]
+            }
+        ]
+    }
+```
+