preparation of working draft as outlined by Raphael

Hi all,

As I was trying to create a dense document on use cases & requirements
as discussed yesterday, I thought it best to create a new section on
the main wiki page
(http://www.w3.org/2008/WebVideo/Fragments/wiki/Main_Page) called
"Preparation of Working Draft".

I have entered the whole structure that Raphael outlined yesterday for
the working draft, so if you are keen to start editing any of these
sections, the structure is there now.

Hope that's ok.

Cheers,
Silvia.