Re: [heycam/webidl] Import (and fix) the promises guide (#490)

It seems like using https://tc39.github.io/ecma262/#sec-createresolvingfunctions (and then adding a [[Promise]] field to the result) would work, although I'm a bit unsure about the consequences of a promise floating around with multiple resolve/reject functions associated with it (one from user code and one from the UA).

Ideally UA code should not be resolving/rejecting user-provided promises. So maybe there is a better structure than the one I outlined above, hmm.

For example, [[Resolve]] and [[Reject]] could be null for user-provided promises, and the first steps of "resolve a promise"/"reject a promise" could assert they are non-null, i.e. assert that the promise was UA-created and not user-created?

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