[w3c/push-api] Add answers to the Security and Privacy self-review (#264)

See https://www.w3.org/TR/security-privacy-questionnaire/. It seems easy enough to just check this in.

/cc @LJWatson
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/push-api/pull/264

-- Commit Summary --

  * Add answers to the Security and Privacy self-review

-- File Changes --

    A security-privacy-questionnaire.md (99)

-- Patch Links --

https://github.com/w3c/push-api/pull/264.patch
https://github.com/w3c/push-api/pull/264.diff

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