Calculating coordinates of a yellow checker piece.

Sorry if my spacing is off. I'm working on my Mac partition to write code and transferring it to Linux is not as seamless as I'd like it to be.

Coordinates are only being calculated for the a yellow checker piece. Once we verify that's working 100% in a lab setting, I'll get it working for red pieces, and refactor code to handle general cases.

Also, I've added in some more comments.