cesar/ledger-prototype @ end-to-end

Cesar Rodas cdfc02c81a Improved negative balance		2 lat temu
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docs	c26f2d560c Introduced a rev-id	2 lat temu
src	cdfc02c81a Improved negative balance	2 lat temu
tests	cdfc02c81a Improved negative balance	2 lat temu
Cargo.toml	ac164a49e4 Add tests	2 lat temu
main.rs	14e39a31d9 Made process() sync and use RwLock (from parking_lot) instead of a Mutex	2 lat temu