(cron) Add tenplates

src/opnsense/service/templates/OPNsense/Cron/+MANIFEST

+name: opnsense-cron
+version: 0.1
+origin: opnsense/cron
+comment: OPNsense Cron configuration
+desc: configuration templates for Cron
+maintainer: jos at opnsense.org
+www: https://opnsense.org
+prefix: /

src/opnsense/service/templates/OPNsense/Cron/+TARGETS

+user.cron:/var/cron/tabs/root

src/opnsense/service/templates/OPNsense/Cron/user.cron

+# DO NOT EDIT THIS FILE - OPNsense auto generated file.
+# (Cron version -- $FreeBSD$)
+SHELL=/bin/sh
+PATH=/etc:/bin:/sbin:/usr/bin:/usr/sbin
+# Order of crontab fields
+#   minute      hour        mday        month       wday        command
+{% if helpers.exists('OPNsense.cron.jobs') %}
+{%   for job in helpers.toList('OPNsense.cron.jobs.job') %}
+# Origin/Description: {{job.origin}}/{{job.description}}
+{{job.minutes}} {{job.hours}}   {{job.days}}    {{job.moths}}   {{job.weekdays}}   configd {{job.command}} '{{job.parameter}}'
+{%  endfor %}
+{% endif %}
\ No newline at end of file