Add some comments to freecell.hs.
Add some comments to freecell.hs.

kevintvh/sodium,kevintvh/sodium,kevintvh/sodium,jam40jeff/sodium,kevintvh/sodium,jam40jeff/sodium,kevintvh/sodium,jam40jeff/sodium,kevintvh/sodium,jam40jeff/sodium,jam40jeff/sodium,jam40jeff/sodium,jam40jeff/sodium,jam40jeff/sodium,kevintvh/sodium,kevintvh/sodium