[w3c/editing] add input events and clipboard api to readme (#320)

These specs are actively developed and they are listed in our charter as being on our todo-list. Therefore, they should be listed in the readme as well.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/editing/pull/320

-- Commit Summary --

  * add input events and clipboard api to readme

-- File Changes --

    M README.md (2)

-- Patch Links --

https://github.com/w3c/editing/pull/320.patch
https://github.com/w3c/editing/pull/320.diff

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