Renamed "FaD Apocalipse.txt"

Renamed "FaD Apocalipse.txt" To "FaD-Apocalipse.txt" So It Does Not
Conflict With The Gamemode's Folder's Name When Downloading From GitHub
Update README.txt
Renamed ConVar "ZombiesToSecondClass"

Renamed ConVar "ZombiesToSecondClass" To "fa_zombiesgoal_classtwo"
Deleted The Old Gamemode.txt