[w3c/webcomponents] Add references to JSON, CSS Modules (#828)

And links to the explainers hosted in the proposals folder.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/webcomponents/pull/828

-- Commit Summary --

  * Add references to JSON, CSS Modules

-- File Changes --

    M README.md (4)

-- Patch Links --

https://github.com/w3c/webcomponents/pull/828.patch
https://github.com/w3c/webcomponents/pull/828.diff

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