create

1. Create the service directory.
   mkdir /etc/sv/<service>
2. Create the down file for testing.
   touch /etc/sv/<service>/down
3. Create the run script.
   ${EDITOR} /etc/sv/<service>/run
4. Add the executable permission to the run script.
   chmod +x /etc/sv/<service>/run
5. Create the link on /var/services.
   ln -s /etc/sv/<service> /var/service/.
6. Test the service.
   sv once <service>
7. If it worked as expected, remove down.
   rm /etc/sv/<service>/down