Include drupal_add_css in example template.php file

I just started using Square Grid for a couple of my projects, and so far I'm loving the flexibility of it; but it took me a while to figure out why my custom CSS files weren't loading from the .info file. When I looked in template.php for the theme, I noticed that you were adding them there via drupal_add_css.

This might be a good thing to include in the example template.php file and the theme documentation.

Thanks for a great theme!