docs: Add documentation about contribution in README

Bacula uses unusual contribution workflow, where instead of
merge-requests changes have to be sent via issues. So make sure it is
documented.

Fixes: https://gitlab.bacula.org/bacula-community-edition/bacula-community/-/issues/2726
Thanks Konstantin Kharlamov

diff --git a/bacula/README b/bacula/README
index 65b441d7b9851504e21cdd3af3696ba614cceb20..8d2864474959cc5827729bf33fbffdc186634f4b 100644 (file)
--- a/bacula/README
+++ b/bacula/README
@@ -70,3 +70,9 @@ parameters needed to deal with FreeBSD tape drivers.
 
 License:
 Please see the file LICENSE for the terms of the license.
+
+Contributing:
+Contribution requires creating [an issue](https://gitlab.bacula.org/bacula-community-edition/bacula-community/-/issues)
+describing your changes, and then attaching commits produced via `git format-patch -n --stdout > 1.patch` 
+command, where `n` is the number of commits.
+