Created simpleClient.go for number guesser.

simpleClient just reads input from the user and writes it to the server,
and prints the server's response. It's real simple.
The simplest GUI ever!

The number guesser server now has a really, really, really simple GUI
which displays the server's address, port, current high guess, current
low guess, and prints the winner when a winner happens.

What's cool about this? Not all that much, but it can how be displayed
on a screen during competition so that people can see what's going on,
in real time.

It also has a start/reset button and a quit button. The quit button is
probably redundant.