adds explanation about a default super admin into the README.md file

README.md

@@ -52,4 +52,9 @@ Go into the NovaServiceProvider.php file and add the next logic into the gate()
 Gate::define('viewNova', function ($user) {
     return $user->role_admin;
 });
-```
+```
+
+### If you want to seed a default super admin, run the next command
+```
+php artisan db:seed --class=SuperAdminSeeder
+```