add prefix/suffix variables

variables.tf

@@ -52,3 +52,13 @@ variable "aws_secret_key" {
   type = string
   sensitive = true
 }
+variable "name_prefix" {
+  description = "The prefix for all your resources"
+  default     = "demostar"
+  type        = string
+}
+
+variable "name_suffix" {
+  description = "The suffix for all your resources, suggest generating a unique value for each deployment"
+  type        = string
+}