Enhance README with detailed basic operations #128

Job	Run time
basic-operations/anchor/burn	22m 5s
basic-operations/anchor/update	22m 12s
counter/anchor	21m 33s
basic-operations/anchor/create	12m 41s
create-and-update	12m 38s
basic-operations/anchor/reinit	12m 35s
basic-operations/anchor/close	21m 59s
basic-operations/anchor/create-nullifier	12m 11s
	2h 17m 54s

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