Create Igold backed by Iusd

if the issue is waiting on a price feed for gold to ada I propose we instead create the igold asset backed by the Iusd asset, as chainlink has a price feed for XAU/USD.

Indigo runs on Cardano. Unfortunately Chainlink does not yet run on Cardano. So Indigo cannot directly make use of Chainlink’s feeds. An intermediary would be required to create a new price feed interfacing Chainlink with Cardano.