Update prover & add test

prover/README.md

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+## Test Prover
+
+### Server Proof API
+It is necessary to have a docker with server locally.
+
+The instructions in the following link can be followed:
+https://github.com/hermeznetwork/test-info/tree/main/cli-prover
+
+> It is necessary to consult the pre-requirements to follow the steps of the next summary
+
+A summary of the steps to follow to run docker would be:
+
+- Clone the repository: https://github.com/hermeznetwork/test-info
+- `cd cli-prover`
+- `./cli-prover.sh -s localhost -v ~/prover_data  -r 22`
+- To enter docker: `docker exec -ti docker_cusnarks bash`
+- Inside the docker: `cd cusnarks; make docker_all FORCE_CPU=1`
+- Inside the docker: `cd config; python3 cusnarks_config.py 22 BN256`
+- To exit docker: `exit`
+- Now, the server API can be used. Helper can be consulted with: `./cli-prover.sh -h`
+- Is necessary to initialize the server with: `./cli-prover.sh --post-start <session>`
+- When `./cli-prover.sh --get-status <session>` is `ready` can be run the test.
+
+> The session can be consulted with `tmux ls`. The session will be the number of the last session on the list.
+
+### Test
+
+`INTEGRATION=1 go test`