[w3c/IndexedDB] Add accessibility section draft. (#328)

Closes #327

 * [x] Confirmed there are no ReSpec/BikeShed errors or warnings.
 * Implementation commitment - N/A

I dropped in an initial sketch of an Accessibility Considerations section. A few came to mind, but I'm sure there are more to consider, and more formal ways of describing requirements.

Suggestions, links, and other reviewers wanted!
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/IndexedDB/pull/328

-- Commit Summary --

  * Add accessibility section draft. Resolves #327

-- File Changes --

    M index.bs (10)

-- Patch Links --

https://github.com/w3c/IndexedDB/pull/328.patch
https://github.com/w3c/IndexedDB/pull/328.diff

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