[w3c/webpayments-methods-tokenization] Add missing images from spec proposal (#1)

The html page had missing images. This PR adds them back, taken from the proposal at https://w3c.github.io/webpayments/proposals/tokenized_cards.html
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/webpayments-methods-tokenization/pull/1

-- Commit Summary --

  * missing images from proposal

-- File Changes --

    A issuerTokens.png (0)
    A networkTokens.png (0)

-- Patch Links --

https://github.com/w3c/webpayments-methods-tokenization/pull/1.patch
https://github.com/w3c/webpayments-methods-tokenization/pull/1.diff

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