Update README.md

terraform-provider-aws/create-vpc-dynamic/README.md

@@ -30,6 +30,12 @@ To consolidate all sg rules combinations in one main map and still call them usi
   }
 }
 
+# you can set the default for sg_type depending on your vm deployment see example below
+  variable "sg_type"{
+      default = "WEB" 
+      }
+
+
 # DYNAMIC sg rules using FOR_EACH LOOP and local variable
 resource "aws_security_group_rule" "terra_sg_rule" {
   for_each = local.sg_mapping[var.sg_type]