public function __construct(User $user)
 {
     $this->id = $user->getId();
     $this->username = $user->getUsername();
 }
 private static function insert(User $model)
 {
     $db = Db::getInstance(\ConferenceScheduler\Configs\DatabaseConfig::DB_INSTANCE);
     $query = "INSERT INTO users (username,password,email,telephone) VALUES (:username, :password, :email, :telephone);";
     $result = $db->prepare($query);
     $result->execute([':username' => $model->getUsername(), ':password' => $model->getPassword(), ':email' => $model->getEmail(), ':telephone' => $model->getTelephone()]);
     $model->setId($db->lastInsertId());
 }