beginning of info manual

Signed-off-by: Mattias Andrée <maandree@operamail.com>
info: overview

Signed-off-by: Mattias Andrée <maandree@operamail.com>
m

Signed-off-by: Mattias Andrée <maandree@operamail.com>
info: invoking

Signed-off-by: Mattias Andrée <maandree@operamail.com>