Add checkers rules module to implements checkers rule

[AnthoGdn]

This maven module implements 3 methods :

• getInitializedCheckersBoard: get initialized checkers board;
• isValidMove: take a initial checkers board, checkers board witch represent a move and player number in parameters. This method indicate if move is correct;
• getAvailableMoves: take checkers board and player number and get available moves.