I am a novice in web developing with Laravel 5. I installed asGgardCMS and After seeing asgardCms codes, I found that there is nothing codes in app/Http/route.php file and r
You can load custom route files within a Service Provider. AsgardCMS is doing it the same way, see this method in the Core RoutingServiceProvider that loads the backend routes:
https://github.com/AsgardCms/Core/blob/master/Providers/RoutingServiceProvider.php#L77
The Laravel docs provide a simple example in the package development section:
http://laravel.com/docs/5.1/packages#routing