[w3c/manifest] [Appendix] Add crawl opt-out (closes #498) (#499)

Adding an Appendix section of developer guidance including how developers can opt-out of web crawl.

Also adds a placeholder for some additional examples.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/499

-- Commit Summary --

  * [Appendix] Add crawl opt-out (closes #498)

-- File Changes --

    M index.html (27)

-- Patch Links --

https://github.com/w3c/manifest/pull/499.patch
https://github.com/w3c/manifest/pull/499.diff

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