Add sample for iothub with private link

quickstart/201-private-link-iothub-builtin-endpoint/outputs.tf

@@ -0,0 +1,19 @@
+output "resource_group_name" {
+  description = "The name of the created resource group."
+  value       = azurerm_resource_group.rg.name
+}
+  
+output "virtual_network_name" {
+  description = "The name of the created virtual network."
+  value       = azurerm_virtual_network.vnet.name
+}
+  
+output "iothub_subnet_name" {
+  description = "The name of the created subnet for iothub."
+  value       = azurerm_subnet.snet.name
+}
+
+output "iothub_name" {
+  description = "The name of the created iothub."
+  value       = azurerm_subnet.snet.name
+}