Add spec for the position (0, 0) after rotating by 90 degrees right
Add spec for the invariant position of rotating by 90 degrees right
Add spec for the position invaraiant when rotating by 270 degrees right
Add spec for rotatin (0, 0) by 270 degrees right
Add spec for rotating the lower left corner by 90 degrees right
Add spec for rotating the lower left corner 270 degrees right
Document RotateRightBy270Degrees symmetry