[mediacapture-record] Add explainer document

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

== Add explainer document ==
>From [TAG 
review](https://github.com/w3ctag/spec-reviews/issues/131#issuecomment-257478126):
> Would like to see an explainer collating the scenarios, how to use 
them, and example code for each

Please view or discuss this issue at 
https://github.com/w3c/mediacapture-record/issues/86 using your GitHub
 account

Received on Wednesday, 2 November 2016 09:11:31 UTC