[w3c/manifest] Add iarc_rating_id (resolves #523) (#567)

See discussion in Issue #523

Signed-off-by: Rob Dolin <robdolin@microsoft.com>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/567

-- Commit Summary --

  * Add iarc_rating_id (resolves #523)

-- File Changes --

    M index.html (34)

-- Patch Links --

https://github.com/w3c/manifest/pull/567.patch
https://github.com/w3c/manifest/pull/567.diff

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