added cleanboard

src/backend/Board.java

@@ -72,7 +72,8 @@ public class Board {
 	} 
 	
 	public void cleanBoard() { 
-		//TO DO
+		this.board = new Piece[width][height]; // should work ?
+	    //this.isTurnWhite = true;
 		}
 	
 	public String toString() {