Ignore .zip files

No reason for them to be in a repo
Added comments

Explained what the code does in preparation for it to be turned in.
Made the spheres more detailed

Changed the number of "sides" for the sphere from 20 to 100 with no
affect on simulation speed.  Also added more comments to describe the
texturemap creation process.
Added a readme file

This is to follow the specifications of the project.