Document public API and encodings

[tzemanovic]

In order to build the Ledger application we need to know how transactions are encoded and decoded, what transaction types exists, what address types exist, ... (really how to build a wallet and/or client from scratch).

This should include the types/API used for MASP.

[tzemanovic]

we have done the first part in anoma/anoma#887 - but we still need to add MASP once more stable

[cwgoes]

@tzemanovic is this still accurate?

[tzemanovic]

@tzemanovic is this still accurate?

yes, I think we still need to add masp types. The deployed spec is here https://d39rezrq9h4sx4.cloudfront.net/specs/encoding.html btw