Add a git-publish configuration file

git-publish [1] is a convenient tool to send patches and has been
popular among QEMU developers.  Recently it has been made available in
Fedora/Debian official repo.

[1]: https://github.com/stefanha/git-publish



Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20190822144427.24085-1-philmd@redhat.com>