[mediacapture-output] Add explainer document

dontcallmedom has just created a new issue for 
https://github.com/w3c/mediacapture-output:

== Add explainer document ==
>From [TAG 
review](https://github.com/w3ctag/spec-reviews/issues/132#issuecomment-257475407):
> we would really like to see an explainer document with some same 
code examples of use

Please view or discuss this issue at 
https://github.com/w3c/mediacapture-output/issues/61 using your GitHub
 account

Received on Wednesday, 2 November 2016 09:09:51 UTC