README: Document PoE set commands

[davidk]

Hello Martin,

I hope this finds you well. I have added documentation for the set section of the PoE commands in ntgrrc.

I mirrored the style of the existing documentation, but please let me know if you have any feedback or changes that you would like to see.

[codecov-commenter]

Codecov Report

Merging #14 (0c97bbe) into main (8708faa) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #14   +/-   ##
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  Coverage   40.40%   40.40%           
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  Files          14       14           
  Lines         646      646           
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  Hits          261      261           
  Misses        376      376           
  Partials        9        9           

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[nitram509]

Excellent. Thank you very much, David. 👍