void UserModel::addUser(const QString &licensePlateNumber, int parkingSpotNumber)
{
    beginInsertRows(QModelIndex(), mUsers.size(), mUsers.size());
    UserData userData;
    userData.setLicensePlateNumber(licensePlateNumber);
    userData.setParkingSpotNumber(parkingSpotNumber);
    mUsers.append(userData);
    endInsertRows();
}