feat: implement a simple version of the router service

modules/@angular/router/index.ts

@@ -0,0 +1,7 @@
+export { Router } from './src/router';
+export { UrlSerializer, DefaultUrlSerializer } from './src/url_serializer';
+export { RouterState, ActivatedRoute } from './src/router_state';
+export { RouterOutletMap } from './src/router_outlet_map';
+
+import { RouterOutlet } from './src/directives/router_outlet';
+export const ROUTER_DIRECTIVES = [RouterOutlet];