[opensuse-buildservice] [obs-signd] user documentation for sign.c

Hi, all! I am working on the Copr lightweight build service ( http://fedorahosted.org/copr ) and we want to utilize obs-signd for package signing. In the past few days i've managed to run signd and use /bin/sign to manually sign rpms, but lack of up-to date documentation in the obs-signd is no good. I've tried to document my findings, and I would be glad if authors or other person familiar with signd will review and correct (or even add :) ) manpage. Changes available in attachement or here https://github.com/evilkost/obs-sign/commit/0d68bd8ea34e507c1212d12ce03cab74... . -- Best regards, Gologuzov Valentin.