Autoload nested folder classes in custom namespace with composer

Question

i have these directory and file structure.

i want to load my Wtf class in Models namespace.

in fact i want to add some providers to my project and want to locate them in own folder for classify them but call them with one namespace

its possible?

.
├── composer.json
├── index.php
├── src
│   ├── Controllers
│   │   └── GameController.php
│   ├── Game
│   │   └── Game.php
│   ├── Models
│   │   ├── Game.php
│   │   └── Wtf
│   │       └── Wtf.php
│   └── Player
│       └── Player.php
└── vendor
    ├── autoload.php
    └── composer
        ├── autoload_classmap.php
        ├── autoload_namespaces.php
        ├── autoload_psr4.php
        ├── autoload_real.php
        ├── autoload_static.php
        ├── ClassLoader.php
        └── LICENSE

Error

[500]: GET / - Uncaught Error: Class 'Rp76\Models\Wtf' not found in /home/reza/www/wtf/index.php:13
Stack trace:
#0 {main}
  thrown in /home/reza/www/wtf/index.php on line 13

composer.json

{
  "autoload": {
    "psr-4": {
      "Rp76\\": "src/"
    }
  }
}

index.php

<?php

use Rp76\Game\Game;
use Rp76\Controllers\GameController;
use Rp76\Player\Player;

require_once "vendor/autoload.php";

new Game();
new Player();
new GameController();
new \Rp76\Models\Game();
new \Rp76\Models\Wtf();

Wtf.php

<?php

namespace Rp76\Models;

class Wtf
{
    public function __construct()
    {
        echo 'Wtf<br/>';
    }
}