[w3c/quota-api] Add 'beware' warnings to spec/readme (#13)

Cribbing from the [WebSQL spec](https://www.w3.org/TR/webdatabase/) - here's a really obnoxious warning to steer developers away from this.

(For https://github.com/w3c/quota-api/issues/12)

/cc: @annevk @chaals
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/quota-api/pull/13

-- Commit Summary --

  * Add 'beware' warnings to spec/readme

-- File Changes --

    M README.md (4)
    M index.html (6)

-- Patch Links --

https://github.com/w3c/quota-api/pull/13.patch
https://github.com/w3c/quota-api/pull/13.diff

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/w3c/quota-api/pull/13