Add example for MySQL Flexible Server Database

quickstart/201-mysql-fs-db/variables.tf

@@ -0,0 +1,9 @@
+variable "name_prefix" {
+  default     = "mysqlfs"
+  description = "Prefix of the resource name."
+}
+
+variable "location" {
+  default     = "eastus"
+  description = "Location of the resource."
+}