Add an example of sql security alert policy (#241)

* add example of sql security alert policy

---------

Co-authored-by: Nanxuan Xu <nanxu@microsoft.com>

quickstart/101-sql-security-alert-policy/outputs.tf

@@ -0,0 +1,12 @@
+output "resource_group_name" {
+  value = azurerm_resource_group.rg.name
+}
+
+output "sql_server_name" {
+  value = azurerm_mssql_server.server.name
+}
+
+output "admin_password" {
+  sensitive = true
+  value     = local.admin_password
+}