Add a short howto and example for WS.

Refs #4173


git-svn-id: svn://svn.twistedmatrix.com/svn/Twisted/branches/getaddrinfo-4362@33775 bbbe8e31-12d6-0310-92fd-ac37d47ddeeb
Derp. Undo wrong-branch commit.


git-svn-id: svn://svn.twistedmatrix.com/svn/Twisted/branches/getaddrinfo-4362@33776 bbbe8e31-12d6-0310-92fd-ac37d47ddeeb