[httpslocal/usecases] [Requirements] separate and refine requirements (#11)

This PR separates Requirements.md from UseCases.md, and refines the requirements in detail. Also, this addresses several comments in https://github.com/httpslocal/usecases/issues/4.

@dajiaji Could you please review this PR?
@igarashi50 Any comments and suggestions are welcome.
You can view, comment on, or merge this pull request online at:

  https://github.com/httpslocal/usecases/pull/11

-- Commit Summary --

  * separate and refine requirements

-- File Changes --

    A Requirements.md (67)
    M UseCases.md (44)

-- Patch Links --

https://github.com/httpslocal/usecases/pull/11.patch
https://github.com/httpslocal/usecases/pull/11.diff

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