F2F follow up, Privacy and Security

Hi Everyone,

As part of the follow up from the face to face, here is the PR John Pallett
put together detailing some of the privacy and security risks of AR it's
very much worth reading. To get a good understanding of the issues:

https://github.com/immersive-web/privacy-and-security/pull/15/files?short_path=4298cc0#diff-4298cc0cf8291ec04a133a6b0c0d459c

Ada