better docs

bin/mpt-test/README.md

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+# mpt-test
+
+This tool aims to verify mainnet blocks for the MPT circuit.
+
+## Running tests
+
+Just run `cargo run --release`
+
+## Adding new blocks to prove
+
+In order to add more blocks to prove you have to:
+
+- Add new entry in the `access-lists` folder
+- Set the environment variable `WEB3_SERVICE_PROVIDER` to a mainnet JSON-RPC provider
+- Run the tests again
+
+
+## How
+

bin/mpt-test/test_mainnet_blocks.sh

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+cargo run --release