It used to be a standard of good writing to always expand acronyms at first use. That seems to be gone now as frequently I don't see that in practice much anymore.
For others - GFW => Great Firewall (of China)
I honestly thought Games For Windows
I was thinking it was either Games for Windows or Git for Windows, and missed "Great Firewall" on first skim of the Readme.
I was about to post the same comment. It's really annoying when someone assumes that everyone will know some uncommon acronyms.