adding blank template files, adding generic comment header in style.css

At first, I was unable to use the boilerplate repo as theme I could network activate. That was probably due to some blank template files being missing. So I added a bunch of blank template files, and a generic comment header in style.css

The effect of doing this allows the user to clone the repo, and network activate it for potential use as a theme.

However, since the template files are blank, it will not produce any markup.