Docu - Create a new Add-on / WidgetSet

I want ot create a new Add-on with vaadin 7 with:
Clientside (with gwt)

I have found a documentation for vaadin 6 in

Is there also a documentation for vaadin 7?
Where can i get some infos for it?

The Vaadin 7 docs are located at

Inside Vaadin Framework you will find also sections related to
client side widgets
client-server integration