declared user & pwd as vars

quickstart/101-aks-cluster-windows/variables.tf

@@ -20,4 +20,16 @@ variable "node_count_windows" {
   type        = number
   description = "The initial quantity of Windows nodes for the node pool."
   default     = 1
+}
+
+variable "admin_username" {
+  type        = string
+  description = "The admin username for the Windows node pool."
+  default = "azureuser"
+}
+
+variable "admin_password" {
+  type        = string
+  description = "The admin password for the Windows node pool."
+  default = "Passw0rd1234Us!"
 }