public function createAction()
{
//create a new todo item
$todo = new TodoItem();
$todo->title = $this->_params['title'];
$todo->description = $this->_params['description'];
$todo->due_date = $this->_params['due_date'];
$todo->is_done = 'false';
//pass the user's username and password to authenticate the user
$todo->save($this->_params['username'], $this->_params['userpass']);
//return the todo item in array format
return $todo->toArray();
}