[whatwg/streams] Early draft of WritableStream "Design Philosophy" section (#718)

This is supposed to help implementors and others understand the design
principles.

Markup isn't done properly yet, so please evaluate the text only.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/streams/pull/718

-- Commit Summary --

  * Early draft of WritableStream "Design Philosophy" section

-- File Changes --

    M index.bs (37)

-- Patch Links --

https://github.com/whatwg/streams/pull/718.patch
https://github.com/whatwg/streams/pull/718.diff

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