[w3c/permissions] Update README.md (#289)

closes #288 

The following tasks have been completed:
 * added link and reformatted a little

Was wondering if I should also provide a raw link instead of just linking it to a header

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/permissions/pull/289

-- Commit Summary --

  * Update README.md

-- File Changes --

    M README.md (3)

-- Patch Links --

https://github.com/w3c/permissions/pull/289.patch
https://github.com/w3c/permissions/pull/289.diff

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