[w3c/editing] add draft charter for the future Editing WG (#276)

please review the draft and complete all those tags marked with "todo".
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/editing/pull/276

-- Commit Summary --

  * add draft charter

-- File Changes --

    A charter-drafts/editing-2021.html (543)

-- Patch Links --

https://github.com/w3c/editing/pull/276.patch
https://github.com/w3c/editing/pull/276.diff

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https://github.com/w3c/editing/pull/276