Create unpivot gem docs

[kathweinschenkprophecy]

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• To see the specific tasks where the Asana app for GitHub is being used, see below:
  • https://app.asana.com/0/0/1208853397650075

[atbida]

Looks great @kathweinschenkprophecy !
Abhinav / Shashank will be able to specify which version of the "ProphecySparkBasics" package is needed to see the Unpivot Gem in the dropdown menu. That version can be added when they provide it.

Regarding the failed check, try running this on your local branch:
pre-commit run --all-files
git add .
pre-commit run --all-files

[atbida]

I didn't deploy this locally b/c I am off to the doc but looks good to me!