[Minor] Steam page should probably have attribution or link to original FFH II mod

[dzfischer]

First, want to say, very nice work!

Second though, it would be good to have something referencing the original Civ IV source:
https://forums.civfanatics.com/threads/mod-fall-from-heaven-ii.171398/

Bonus points if you're willing to point out there's still active work being done on it ;)
https://forums.civfanatics.com/threads/ashes-of-erebus-rifes-follow-up-download-and-bug-reports.625762/
https://github.com/black-imperator/AoEDev