[w3c/webpayments] Add payment method best practice proposal (#176)

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

  https://github.com/w3c/webpayments/pull/176

-- Commit Summary --

  * Add payment method best practice proposal

-- File Changes --

    M proposals/README.md (3)

-- Patch Links --

https://github.com/w3c/webpayments/pull/176.patch
https://github.com/w3c/webpayments/pull/176.diff

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