Fixed 'autopilot' mistake of naming file with an MD extension

quickstart/101-resource-group/providers.tf

@@ -0,0 +1,15 @@
+terraform {
+
+  required_version = ">=0.12"
+  
+  required_providers {
+    azurerm = {
+      source = "hashicorp/azurerm"
+      version = "~>2.0"
+    }
+  }
+}
+
+provider "azurerm" {
+  features {}
+}