[issue2619] Document PEP 3118

[Benjamin Peterson]

Benjamin Peterson <musiccomposition at gmail.com> added the comment:

The bulk of the C-API is in r66476. Somebody definitely needs to review
it; I mostly extracted it directly from the PEP, and I understand that's
a little different from reality here. I'll lower priority, and we can
close it after some looks at my changes. Thanks!

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priority: deferred blocker -> normal

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