Introduce GOVERNANCE document and empty RESOLUTIONS file.

Introduce GOVERNANCE document and empty RESOLUTIONS file.

To understand the process that lead to this commit, you'll probably need
to read all of:

http://lists.scsys.co.uk/pipermail/dbix-class/2016-October/date.html
http://lists.scsys.co.uk/pipermail/dbix-class/2016-November/date.html
http://lists.scsys.co.uk/pipermail/dbix-class/2016-December/date.html

Any attempt on my part to summarise it would likely seem insufficiently
accurate to me and biased to at least some readers, so I'm not even going
to pretend to try. If you're trying to achieve a tl;dr, I suggest checking
the December archive in the hopes that somebody posts a summary there some
time after I push this commit.