Added a note on the main screen to make it clear that Ctrl-C quits the game.

In regards to this: In the cross-platform version, I used multi-threading (via a delegate function) to get the game to accept player input (such as move up and down). This seems to have introduced a subtle bug: after you die you sometimes have press enter more than once, and also it prints out some random garbage to the screen before you can press enter. I’ve left the bug in for now, since it’s not fatal, and I actually whittled down the amount of time you would have to wait quite a bit. This is to explain that when I attempted to add a quit button such as the Escape key, it sometimes randomly quit after you died. Somehow, the loop/thread accepting input is working fine as long as the game is in action, but whenever it has to stop it’s generating random output. Which is slightly irritating, but I assume I’ll figure what’s wrong eventually.