[heycam/webidl] docs(README): contributing section (closes #136) (#143)

* Define what labels mean
You can view, comment on, or merge this pull request online at:

  https://github.com/heycam/webidl/pull/143

-- Commit Summary --

  * docs(README): contributing section (closes #136)

-- File Changes --

    M README.md (13)

-- Patch Links --

https://github.com/heycam/webidl/pull/143.patch
https://github.com/heycam/webidl/pull/143.diff

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