Add A Survival Fireteam Zombies Mode

[imidan1234]

Survival zombies mode can be so good. Players can compare themselves to other players and it would inspire so many people to play Fireteam again like we all loved back in the days.
I would love to suggest that if Valofe will bring a new cool Fireteam map in the Cabin Fever concept so many people would love to play it we all enjoyed Cabin Fever back in the days.