Fix pawn starting square rule bug (black vs white)

Add backwards pawn move rule and comments for all rules

Fix bug with wrong operator in pawn valid move logic

Start fleshing out Chess class and isValidMove logic for pawns

Add getSquareForPosition method to Board

Add more basic functionality for console IO

Get initial console IO working

Implement a describe board function in main so that a fully functional chess board displays in the console

Remove std::endl from describe methods of pieces

Implement correct initial board with newly created pieces

Add remaining piece classes and update describe methods

Rename Pawn and Empty to PiecePawn and PieceEmpty, clean up a bit

Change Move struct a bit

Initialize color and type member variables in Piece.h

Add testing project and add Game.h and Game.cpp