[whatwg/encoding] Add Streams Explainer (#143)

Add a new file, streams-explainer.md, which explains the integration of
Streams into the Encoding Standard for a general audience.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/encoding/pull/143

-- Commit Summary --

  * Add Streams Explainer

-- File Changes --

    A stream-explainer.md (206)

-- Patch Links --

https://github.com/whatwg/encoding/pull/143.patch
https://github.com/whatwg/encoding/pull/143.diff

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