var SteamTotp = require('steam-totp');
var user = new SteamUser();
user.logOn({
    accountName: "EnterAccountName",
    password: "EnterPassword",
    twoFactorCode: SteamTotp.getAuthCode("")
});

user.on('webSession', function() {
    console.log('Logged in!');
    user.setPersona(SteamUser.Steam.EPersonaState.Offline) // Set to offline or online - your choice.
    user.gamesPlayed(10); // Enter ID of the steam game. ID is on the steam store link, e.g. CS 1.6: http://store.steampowered$
});