view->pages->index.php for file upload

<section class="content">
    <form action="index.php?page=home" method="post" enctype="multipart/form-data">
      <input type="hidden" name="action" value="add_user">
      <input type="text" name="username" value="frederikdc">
      <input type="file" name="picture" accept="image/png, image/jpeg, image/gif">
      <input type="submit" value="upload image">
    </form>
    <ul>
      <?php foreach($users  as $user): ?>
        <li>
          <p><?php echo $user->username; ?></p>
          <img src="<?php echo $user->picture; ?>" alt="">
        </li>
      <?php endforeach; ?>
    </ul>
</section>