Add conda-store Usability Study Report.md

[smeragoel]

Fixes #817.

Description

This pull request contains the results of the conda-store usability study.

Pull request checklist

• Did you test this change locally?
• Did you update the documentation (if required)?
• Did you add/update relevant tests for this change (if required)?

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[trallard]

I did another pass at this and fixed some bits that were breaking the preview.
I also renamed the file to avoid having spaces in the name.
If the build succeeds I will merge right away.