Kani

Improve README documentation and clarity #18

Job	Run time
Proof unit tests (token-swap)	12s
Proof unit tests (token-fundraiser)	14s
Proof unit tests (escrow)	14s
Proof unit tests (lending)	14s
Proof unit tests (betting-market)	16s
Proof unit tests (vault-strategy)	13s
Proof unit tests (order-book)	12s
Kani proofs (${{ matrix.program }})	-9s
	1m 26s

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