[ADD] Initial code for evaluation function
[ADD] Initial code for evaluation function

There is now some initial code that looks at the evaluation of the
current board state to see who is in a winning position. Currently it
relies on quite primitive rules: piece difference, pawn structure and
mobility.

Eventually it will become more sophisticated as time progresses.

kmiller96/QuantumChessEngine,kmiller96/Quark-ChessEngine,kmiller96/Quark-ChessEngine