[w3c/webpayments-methods-card] Add link to list of card networks (#25)

https://www.w3.org/Payments/card-network-ids
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/webpayments-methods-card/pull/25

-- Commit Summary --

  * Add link to

-- File Changes --

    M index.html (2)

-- Patch Links --

https://github.com/w3c/webpayments-methods-card/pull/25.patch
https://github.com/w3c/webpayments-methods-card/pull/25.diff

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https://github.com/w3c/webpayments-methods-card/pull/25