added NSG ID for output (#59)

Author: agregory999

outputs.tf

@@ -11,4 +11,8 @@ output "operator_instance_principal_group_name" {
 
 output "operator_subnet_id" {
   value = data.oci_core_instance.operator.subnet_id
-}
+}
+
+output "operator_nsg_id" {
+  value = oci_core_network_security_group.operator.id
+}