private static function insert(User $model)
{
$db = Database::getInstance('app');
$query = "INSERT INTO users (username,password,gold,food,grass) VALUES (:username, :password, :gold, :food, :grass);";
$result = $db->prepare($query);
$result->execute([':username' => $model->getUsername(), ':password' => $model->getPassword(), ':gold' => $model->getGold(), ':food' => $model->getFood(), ':grass' => $model->getGrass()]);
$model->setId($db->lastId());
}
