[whatwg/streams] Add Explainer for Byte Streams (#1081)

Add byte-streams-explainer.md.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/1081

-- Commit Summary --

  * add byte streams explainer

-- File Changes --

    A byte-streams-explainer.md (88)

-- Patch Links --

https://github.com/whatwg/streams/pull/1081.patch
https://github.com/whatwg/streams/pull/1081.diff

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https://github.com/whatwg/streams/pull/1081