What kind of a dick would do this to Gentoo, who makes everything available to everyone? I don't understand the world sometimes.
I sincerely hope 4chan users aren't responsible for this, though.
If there is a severe security issue either in GitHub infrastructure or in the Gentoo Foundation's procedures which would allow this kind of breach, having them revealed by a stupid prank is one of the best outcomes you can hope for.
adds readme.me file with text niggers.
source: https://wiki.gentoo.org/wiki/Github/2018-06-28