Add quickstart for Front Door (classic)

quickstart/101-front-door-classic/providers.tf

@@ -0,0 +1,19 @@
+# Configure the Azure provider
+terraform {
+  required_providers {
+    azurerm = {
+      source  = "hashicorp/azurerm"
+      version = "~> 3.27.0"
+    }
+
+    random = {
+      source = "hashicorp/random"
+    }
+  }
+
+  required_version = ">= 1.1.0"
+}
+
+provider "azurerm" {
+  features {}
+}