contrib: gitdm: add a mapping for Janus Technologies

Currently this just includes Marcel who is a fairly prolific
contributor.

Cc: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

contrib/gitdm/group-map-janustech

+#
+# Janus Technologies contributors using non-corporate email
+#
+
+marcel.apfelbaum@gmail.com

gitdm.config

@@ -36,6 +36,7 @@ GroupMap contrib/gitdm/group-map-wavecomp Wave Computing
 GroupMap contrib/gitdm/group-map-cadence Cadence Design Systems
 GroupMap contrib/gitdm/group-map-codeweavers CodeWeavers
 GroupMap contrib/gitdm/group-map-ibm IBM
+GroupMap contrib/gitdm/group-map-janustech Janus Technologies
 
 # Also group together our prolific individual contributors
 # and those working under academic auspices