File README-SUSE.md of Package leafnode

This is package of the latest snapshot of the upstream git repository on
<https://gitlab.com/leafnode-2/leafnode-2> . It seems strange to use git
checkout for the stable server package, but the development has stalled
(as of today 2019-11-18, the last commit is a year old and it is mine),
but the upstream maintainer for whatever reasons doesn't want to make
official release.

There are no scripts or any method of converting the currently existed
leafnode-1 instance to leafnode-2. This is [what I
got](http://krusty.dt.e-technik.uni-dortmund.de/pipermail/leafnode-list/2018q1/002780.html)
from the upstream maintainer:

> Leafnode-2 has some minor update aids in place, one of the most
> important parts is running \"texpire -r\" to rebuild the hashes, and
> \"fetchnews -f\" to re-fetch the active files. See README.html for
> other migration information regarding configuration settings.

For better orientation the package changelog has interspersed records
from leafnode-2 package in the originally leafnode-1 one. They are all
from me (<mcepl@something>) and they are marked as `[leafnode-2]` in the
first line of the record.

There is a droplet for sudoers allowing an user in the group `newsadmin`
to run without a password command:

    sudo -u news /usr/sbin/fetchnews -vvv -e