freedoom/attic: Old Freedoom resources never die, they just get put in the attic

镜像自地址 https://github.com/freedoom/attic

Georgy Samoilov a306d1bc59 Add CREDITS-MUSIC, squash		6 月之前
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alt_rrock17	a306d1bc59 Add CREDITS-MUSIC, squash	6 月之前
old_rrock17	a306d1bc59 Add CREDITS-MUSIC, squash	6 月之前
older_rrock17	a306d1bc59 Add CREDITS-MUSIC, squash	6 月之前