Updated README.txt

Simply makes it more friendly for my editing. I chose not to include the
changes list; it was a pain to deal with, and wasn't worth it to me.
Additions and Modifications to Ship.java

I made a bunch of changes, including the deletion of a whole bunch of
variables and methods. That was done to use a much simpler rotation
system, because the one I had conceived earlier was impractical.
The second change I made was to make way for a health system. This will,
in the future, allow for tracking such that I can delete ships that are
"destroyed" in the game.
Used Tester.java

The change here is basically a proof of concept showing that the
rotation system for the Ship class works properly.