Add "express-domain-middleware.d.ts" (#9396)

* Add "express-domain-middleware.d.ts"

* Add reference comment

express-domain-middleware/express-domain-middleware-tests.ts

@@ -0,0 +1,2 @@
+/// <reference path="express-domain-middleware.d.ts" />
+import fn = require('express-domain-middleware');

express-domain-middleware/express-domain-middleware.d.ts

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+// Type definitions for express-domain-middleware
+// Project: https://www.npmjs.com/package/express-domain-middleware
+// Definitions by: Hookclaw <https://github.com/hookclaw>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/// <reference path="../express/express.d.ts" />
+
+declare module "express-domain-middleware" {
+    import express = require('express');
+    function e(req: express.Request, res: express.Response, next: express.NextFunction): any;
+    export = e;
+}