How to setup another modules with new route files?

I want to create many modules for my applications. After trying very hard i have finally added another module with controller. It is working. But there are some redundancy I want to avoid. And I want to make these modules reusable. That is why I want some suggestions on how I can do that.
It would be very helpful if anyone can help me with writing and adding a new route file in app/Config/Routes.php for a new new module URI mapping. i am not that good with searching that is why I need some direct knowledge about these.

for new module 

PHP Code:

<?php namespace Modules\App\Config;

use CodeIgniter\Config\BaseConfig;

class ModuleAppConfig extends BaseConfig
{
    /*
  *---------------------------------------------------------------
  *  x directory
  *---------------------------------------------------------------

  */
    public $xDirectory = __DIR__ . '/../../../public/upload/x';
} 


Code:

<?php namespace Modules\App\Config;


use Config\Services as BaseService;

class Services extends BaseService
{
    //--------------------------------------------------------------------



}

route.php 

Code:

<?php

/*
* modules\App route.file.
*/

$routes->group('api', ['namespace' => 'Modules\App\Controllers'], function ($routes) {

    $routes->resource('overView');
    $routes->resource('graph');

});

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