CAIP-2 for flow chain

[lmcmz]

Hi there,

I'm trying to add flow blockchain into the list.

[lmcmz]

PR created: #164

[bumblefudge]

See inline comments on #164 for recommendations to improve/iterate (feel free to add additional information when you, or anyone else, comes back to add a CAIP-10 or any other profiles helpful to multichain harmonization)