[html5 setup doc] new chapter about including js dependencies

[T1mL3arn]

No description provided.

[player-03]

We should come up with a consistent way to format file names. You're using code tags (e.g., project.xml), whereas the introductory documents use italics or quotes.

Personally, I'm partial to no formatting (e.g., project.xml), but haven't found any examples of that in this repo.

Edit: having looked through more of the documentation, italics seem to be the closest thing we have to a standard.

[joshtynjala]

In most docs I write, I try to use italics for file names. I borrowed that practice from the house style in O'Reilly programming books.

[T1mL3arn]

I'd say italic style is less distinguishable, but this is more about this site's css (and should it ever be more distinguishable at all).