FEATURE: init module environment

Initialized environment for creating modules.

app/Providers/AppServiceProvider.php

@@ -23,6 +23,7 @@ class AppServiceProvider extends ServiceProvider
      */
     public function register()
     {
+        // register PingPong module extension
         $this->app->register('Pingpong\Modules\ModulesServiceProvider');
     }
 }