[new] sysutils/git-sync a tool to sync git repositories

Hi,

Here is a pretty simple port (it's just a bash script). I have been
using this for quite a while. Over the years I have never had an issue
with sync conflicts or the like.

Information for inst:git-sync-20220127

Comment:
safe, simple git synchronization

Description:
Aautomaticlly synchronize git repositories.

Maintainer: The OpenBSD ports mailing-list <ports@openbsd.org>

WWW: https://github.com/simonthum/git-sync

OK?

Cheers,
Aaron