[w3c/browser-payment-api] Add extension point (#492)

Added extension point for payment app matching.
Based on https://www.w3.org/TR/appmanifest/#dfn-extension-point

Resolves #470 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/browser-payment-api/pull/492

-- Commit Summary --

  * Add extension point

-- File Changes --

    M index.html (41)

-- Patch Links --

https://github.com/w3c/browser-payment-api/pull/492.patch
https://github.com/w3c/browser-payment-api/pull/492.diff

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