[w3c/manifest] feat: add AppBannerPromptOutcome enum (#519)

Part 3, adds AppBannerPromptOutcome enum, which represents the outcome from showing an install prompt. 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/519

-- Commit Summary --

  * feat: add AppBannerPromptOutcome enum

-- File Changes --

    M index.html (37)

-- Patch Links --

https://github.com/w3c/manifest/pull/519.patch
https://github.com/w3c/manifest/pull/519.diff

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