[w3c/manifest] editorial: add browser support table (#694)

Adds a browser support table based on data from caniuse.com (Read about this ReSpec feature [here](https://github.com/w3c/respec/wiki/caniuse))
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/694

-- Commit Summary --

  * editorial: enable caniuse

-- File Changes --

    M index.html (1)

-- Patch Links --

https://github.com/w3c/manifest/pull/694.patch
https://github.com/w3c/manifest/pull/694.diff

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