[Doc] Add server dbus API documentation
[Doc] Add server dbus API documentation

Signed-off-by: Regis Merlino <bf92b28820f6093e0f55b8f19f2762bc8cee2f98@intel.com>

puleglot/dleyna-server,markdryan/dleyna-server,martin-flaska/dleyna-server,martin-flaska/dleyna-server,01org/dleyna-server,jku/dleyna-server,lferrandis/dleyna-server,martin-flaska/dleyna-server,rmerlino/dleyna-server,rmerlino/dleyna-server,puleglot/dleyna-server,em-/dleyna-server,andhe/dleyna-server,lferrandis/dleyna-server,em-/dleyna-server,lferrandis/dleyna-server,andhe/dleyna-server,01org/dleyna-server,lferrandis/pkg-dleyna-server-debian,andhe/dleyna-server,sbianti/dleyna-server,rmerlino/dleyna-server,sbianti/dleyna-server,01org/dleyna-server,jonte/dleyna-server,jonte/dleyna-server,lferrandis/pkg-dleyna-server-debian,UIKit0/dleyna-server,jku/dleyna-server,UIKit0/dleyna-server,sbianti/dleyna-server,markdryan/dleyna-server,em-/dleyna-server,em-/dleyna-server,markdryan/dleyna-server,jonte/dleyna-server,markdryan/dleyna-server,UIKit0/dleyna-server,sbianti/dleyna-server,rmerlino/dleyna-server,martin-flaska/dleyna-server,andhe/dleyna-server,lferrandis/pkg-dleyna-server-debian,puleglot/dleyna-server,01org/dleyna-server,jku/dleyna-server