bool add_player(vector<Player> &player_vector)
{
    string name;
    string comp_name;
    getline(cin, name);
    system("CLS");
    cout << "Podaj login gracza: ";
    getline(cin, name);
    for (int i = 0; i < player_vector.size(); i++)
    {
        comp_name = player_vector[i].get_name();
        if (name == comp_name)
        {
            cout << endl;
            cout << "Wybrany login jest zajety.";
            Sleep(2000);
            return flase;
        }
    }
    player_vector.push_back(Player(name));
    cout << "Gracz " << name << " pomyslnie dodany do ligi.";
    Sleep(2000);
    return true;
}