Create Greencell__PowerProof_2000__nutdrv_qx__2.8.0__01.dev

[hajar97]

Sanity check list

• This PR is named to help easy searches (identify the vendor, device...)

• Data dump file name follows this pattern (safely using ASCII characters):
  <manufacturer>__<model>__<driver-name>__<nut-version>__<report-number>.<extension>
  (more nuances are documented on site).

• This file is placed into a sub-directory named same as the manufacturer.

• Was this content prepared with nut-ddl-dump.sh script?

• Information from upsc discovered fields is provided un-commented.

• Additional data about supported RW variables and/or instant commands
  is provided (as comments)...

• ...prefixed with standardized comment mark-up as documented on site,
  e.g.:

#RW:<var.name>:<type>:<options>

and

#CMD:<command.name>

• Mark-up for other structured comments is followed (for fields, vars,
  etc. as documented on site), where applicable.

• For devices supported only with special settings in their ups.conf
  configuration section (e.g. vendorid and productid required along
  with a USB subdriver), example section content is welcome as a comment.

• For a newly discovered supported device, a sibling PR for the main
  NUT codebase (at least
  docs/driver.list.in,
  or possibly VID/PID and other auto-detection mapping tables in the driver
  sources) is welcome.

• This PR is linked to relevant issue(s) and/or PRs in the NUT project,
  if applicable (new driver submissions, bug fixes/discussions, etc.).