Update the README
Add a nicer font for the example game

The font is "Ringbearer" and is (c) Pete Klassen, 2002. I downloaded it from
here:

  http://www.dafont.com/ringbearer.font

The full distribution for the font, including its readme.html and copyright
notices is in ringbearer.zip. For use in the example game, I've extracted the
.ttf file from the archive and renamed it to ringbearer.ttf (from RINGM___.ttf)
to show the connection with the accompanying .zip file.