[directory-upload] Added Attributes Section (#22)

Addresses WICG/directory-upload#17 and WICG/directory-upload#18 but not yet ready to close them.
You can view, comment on, or merge this pull request online at:

  https://github.com/WICG/directory-upload/pull/22

-- Commit Summary --

  * Added Attributes Section

-- File Changes --

    M proposal.html (13)

-- Patch Links --

https://github.com/WICG/directory-upload/pull/22.patch
https://github.com/WICG/directory-upload/pull/22.diff

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Reply to this email directly or view it on GitHub:
https://github.com/WICG/directory-upload/pull/22