Cosmos-sdk: Genesis Documentation

[rigelrozanski]

Realized that we don't have much in the way of genesis documentation - it would be great to have a genesis spec outlining what the format of the genesis files, and details of processing genesis information. Should also split up information into relevant modules.

Related: #1724

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[cwgoes]

There exist standard JSON schema formats (e.g. this), might be nice to use one of those.

[alessio]

Tendermint docs already (partially) documents genesis: https://tendermint.com/docs/tendermint-core/using-tendermint.html#initialize

I'll take it from there and extend it

[jackzampolin]

@alessio bump on this

[rigelrozanski]

as discussed - this issue will not actually _block_ launch

[gamarin2]

This https://github.com/cosmos/cosmos-sdk/issues/3835 should be part of this concept doc

[jackzampolin]

It looks like we have most of this in the improved module specs. All it would take is a section that explains the params as also being in the genesis file.