create end user documentation / document setup/requirements
As recently seen on tor-talk  it is not clear to end users* how to use TorBirdy, especially what requirements come with it.
We should create an end user quick setup howto for TorBirdy. When such questions  come up we can point to that page.
*) TBH TorBirdy is not end-user ready yet but we should create that page anyway.