Add TODO for getting cron.php working properly.

Config/Nextcloud/cron.sh

@@ -4,6 +4,13 @@
 # This should be added to root's crontab with the full path, such as:
 #   */5 * * * * /opt/Docker/Config/Nextcloud/cron.ksh
 
+# TODO / TBD
+# - Install cron -y on nc-app.
+# - Ensure */5 * * * * /var/www/html/cron.php is an entry for www-data.
+# - Ensure service cron is started and running.
+# - Remove the entry for this file under root on the Docker server.
+# - Test that everything works after an update and reboot of both NC + Docker.
+
 # Check if a job is already going.
 PROG="$(basename -- "${BASH_SOURCE[0]}")"
 RUNNING=`ps -ef | grep $PROG | grep -v grep | grep -v $$ | grep -v "sh -c" | wc -l`