added documentation about the 'screen' client-pattern
added documentation about the 'screen' client-pattern

luebking/fluxbox,Arkq/fluxbox,luebking/fluxbox,olivergondza/fluxbox,naimdjon/fluxbox,naimdjon/fluxbox,lukoko/fluxbox,naimdjon/fluxbox,olivergondza/fluxbox,luebking/fluxbox,luebking/fluxbox,lukoko/fluxbox,lukoko/fluxbox,Arkq/fluxbox,naimdjon/fluxbox,luebking/fluxbox,Arkq/fluxbox,lukoko/fluxbox,naimdjon/fluxbox,Arkq/fluxbox,Arkq/fluxbox,olivergondza/fluxbox,lukoko/fluxbox,olivergondza/fluxbox,olivergondza/fluxbox