[w3c/clipboard-apis] Add PR template (PR #220)

Per resolution to w3c/editing#463, w3c/editcontext#100 introduced a PR template that was agreed upon by the Editing WG. This change introduces the same template in this repository. 

You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/clipboard-apis/pull/220

-- Commit Summary --

  * Update PR template per Editing WG resolution.

-- File Changes --

    M .github/PULL_REQUEST_TEMPLATE.md (19)

-- Patch Links --

https://github.com/w3c/clipboard-apis/pull/220.patch
https://github.com/w3c/clipboard-apis/pull/220.diff

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