[w3c/manifest] WIP: purpose (#493)

@beverloo how about something like:
https://rawgit.com/w3c/manifest/purpose/index.html#purpose-member

Still rough... but looking for feedback. 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/493

-- Commit Summary --

  * WIP: purpose

-- File Changes --

    M index.html (149)

-- Patch Links --

https://github.com/w3c/manifest/pull/493.patch
https://github.com/w3c/manifest/pull/493.diff

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