To launch the app, npm start;
The majority of the code is in the libs directory -- mainly 3 files:
the UI component, in balances.tsx the public data layer, DataService and, a class that the public data layer inherits from, DataServiceCore
The UI component gets imported into the main React app (apps/src/app/app.tsx).
I'm going to add more tests (which can be run via npm test -- in part, to add tests. But, also, because I want to check that my math is correct on the various conversions that are happening. :/