fix folder name with correct provider name

terraform/bpg-simple-vm/variables.tf

@@ -0,0 +1,10 @@
+variable "proxmox_endpoint" {
+  description = "Proxmox URL endpoint"
+  type        = string
+}
+
+variable "proxmox_api_token" {
+  description = "Proxmox API token"
+  type        = string
+  sensitive = true
+}