Initial commit
Add code for a Chess board.

This code does not do anything yet (as in, there is no interaction),
although it compiles just fine. You can load the code from Board.hs into
GHCi, and test it.

Hopefully, in the near future, I will figure out how to do unit tests in
Haskell. For now, it's all up to GHCi.
Write a README.