Re: [w3c/browser-payment-api] Specification to include Flow Diagram (#32)

@adrianhopebailie 

> We can't assume that payment apps will always able to make payments using multiple instruments 
We can't assume it will always be true, but the only example we have today allows this for cards

> that user's will configure them with multiple payment instruments
It won't always be the case, but I would say it is a very common use case and would estimate that the majority of people who hold a single card, hold 2 or more (a good exmaple of why is so they can have both a debit and credit card registered)

> that users won't configure their mediator with a default app (and only have one installed).
I'd expect they will have a default one, absolutely, but we still need the ability to deal with more than one.

I think the details of this come down to the implementation, so I've revised the flow to replace "select payment instrument" with "Select Payment App/Instrument"


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