Users Guide - added basic usage section

[Mike Hearn]

> Either we need to fix that doc, or we need to add
> a controllet for wine itself, so the list is never empty,
> or we need to make control.exe put up a dialog box
> saying "no control panel thingies installed".

Well, I think the plan is for Wine 0.9 to ship with pre-installed
control panel applets, so that bug won't appear, but you're right, it's
a silly bug if that's what it is and it should be fixed.

-- 
Mike Hearn <m.hearn at signal.qinetiq.com>
QinetiQ - Malvern Technology Center