code: public function CreateAction()
    {
      // Checks if the user is connected
      if (Session::islogged())
      {
        // Creates the $data array to store the new comment
        $data['article_id']   = $_GET['id'];
        $data['content']      = $_POST['content'];
        $data['created_date'] = $_POST['date'];
        $data['user_id']      = $_SESSION['user']['id'];
  
        // Creates the comment
        ModelFactory::get('Comment')->create($data);
  
        // Creates a valid message to confirm the creation of a new comment
        htmlspecialchars(Session::createAlert('New comment created successfully !', 'valid'));
  
        // Redirects to the view readArticle
        $this->redirect('article!read', ['id' => $_GET['id']]);
      }
      else {
        // Creates a fail message to ask to be connected
        htmlspecialchars(Session::createAlert('You must be logged in to add a comment...', 'cancel'));
      }
      // Redirects to the view loginUser
      $this->redirect('user!login');
    }
docs: ********************\
  Creates a new comment