Command-line options for AllAboutMonstrs entry

As usual we added command-line options to our run_game.py, but in this case I forgot to mention them in the README

On Linux you can toggle full-screen with F11.  If you are on Windows or OSX I think you need to run:
  run_game.py --full
to get full screen. Otherwise it's 1024x768 which on most monitors these days isn't all that big.
I remember when 800x600 carried a risk of eliminating half your potential user base, but I digress...

./run_game.py --help lists the other options.

;)