[Groff] new file DISTRIBUTIONS

[Bernd Warken]

I propose to start a new file DISTRIBUTIONS in the top directory.
This file will report the maintainers of known distributions.


####### DISTRIBUTIONS
OpenBSD - Ingo Schwarze <schwa...@usta.de>
LinuxMint Debian - Keith Marshall <keithmarsh...@users.sourceforge.net>
Debian - Colin Watson <cjwat...@debian.org
...

Bernd Warken