[w3c/webpayments-methods-tokenization] Document threat model (#36)

Creating an individual issue from the list in #26 in reference to:
  https://github.com/w3c/webpayments-methods-tokenization/wiki/Tokenized-Card

"It would be good to define the threat model here so that we can improve the security considerations. The authors might want to look at https://www.owasp.org/index.php/Threat_Risk_Modeling from OWASP or a similar document."

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https://github.com/w3c/webpayments-methods-tokenization/issues/36