by big O and wdj
- task 1 - render 2 spheres, 1 orbiting the other
- task 1.5 - fix the formatting of the readme!
- task 2 - extend number of spheres to 7
relaive sizes and relative distances
- task 4 - add textures
- task 5 - add lighting from the sun
- task 6 - allow user to pitch and move the camera and zoom
- task 7 - add skybox.