Add simple README demonstrating usage and testing.

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+Multiplayer poker game.  Example usage:
+
+  ./pbot.py -v a,bots/p1.py b,bots/p1.py x,bots/p2.py y,bots/p2.py > example.txt
+
+Run internal tests with
+
+  nosetests --with-doctest --doctest-test *.py