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Added a README.md file to //components/permissions to help document...

.. this are of the code

NOTE: Some links are broken until https://chromium-review.googlesource.com/c/chromium/src/+/2063672 lands
Change-Id: Id02055506eddb912e7dccc86a435c851338481bd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2066546
Commit-Queue: Andy Paicu <andypaicu@chromium.org>
Reviewed-by: Andy Paicu <andypaicu@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Auto-Submit: Andy Paicu <andypaicu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743499}