Add ZK examples: zk-id and zk-vote #121

Job	Run time
basic-operations/anchor/create-nullifier	2m 56s
basic-operations/anchor/burn	2m 56s
counter/anchor	2m 57s
basic-operations/anchor/update	2m 56s
basic-operations/anchor/close	2m 56s
create-and-update	1m 39s
basic-operations/anchor/reinit	3m 12s
basic-operations/anchor/create	2m 57s
	22m 29s

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