title: Prestashop install and use vendor from composer
body: <p>I'm developing a Prestashop (PS) module but I want use composer to install some dependencies.</p>
  
  <p>I found some problems to perform this task. First of all, how include autoload class inside vendor to use the package? and second how use it in my module?</p>
  
  <p>Could you provide me an example?</p>