Add fields of an entity to a form

gistfile1.php

<?php
 $form['#prefix'] = '<div id="wrapper-form">';
    $form['#suffix'] = '</div>';
    
     
    $form['hidden_tipo'] = array(
      '#type' => 'hidden',
      '#value' => $tipo,
    );
    
    $form['nombre'] = array(
      '#type' => 'textfield',
      '#title' => 'Nombre',
      '#description' => 'Nombre',
      '#size' => 60,
      '#maxlength' => 100,
      '#required' => TRUE,
    );
    
   $account = new stdClass;
   $account->is_new = TRUE;
   field_attach_form('user', $account, $form, $form_state);
?>