[w3c/manifest] [Primer] Create file and add text re: web cralwers (#505)

This replaces PR #499
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/505

-- Commit Summary --

  * [Primer] Create file and add text re: web cralwers

-- File Changes --

    A primer.md (15)

-- Patch Links --

https://github.com/w3c/manifest/pull/505.patch
https://github.com/w3c/manifest/pull/505.diff

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