Add (5) MASWE-PRIVACY

[annab-google]

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This PR closes #< insert number here >.

[annab-google]

Hi @cpholguera, please see Privacy weakness by Google` WG.

[cpholguera]

This is awesome, we'll review this soon!

Thanks a lot @annab-google and to the whole WG!

[TheDauntless]

Mostly grammar changes, apart from the copy-paste issue.

[annab-google]

Addressed comments.

[sushi2k]

thank you @annab-google ! This is a really great contribution. I've got a few small things, please have a look.

[annab-google]

Thank you for review @TheDauntless and @sushi2k! Let me know if anything else is pending.