docs: usage guide

packages/rust-verifier/README.md

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+# Rust Verifier CLI Tool
+
+This is a mini CLI tool for exporting Rust verifiers from snarkjs artifacts. It allows you to generate a verifier from a snarkjs verifying key and generate verifier arguments from snarkjs proof and public inputs.
+
+## Usage
+
+### Commands
+
+1. **GenerateVerifier**: Generates a verifier from a snarkjs verifying key.
+2. **GenerateVerifierArguments**: Generates verifier arguments from snarkjs proof and public inputs.
+
+### Examples
+
+#### Generate Verifier
+
+To generate a verifier from a snarkjs verifying key, use the `generate-verifier` command:
+
+```sh
+cargo run -- generate-verifier -v <path_to_verifying_key_file> -o <output_file_path>
+```
+
+**Example:**
+
+```sh
+cargo run -- generate-verifier -v tests/data/proof_of_twitter/vkey.json -o verifier.rs
+```
+
+#### Generate Verifier Arguments
+
+To generate verifier arguments from snarkjs proof and public inputs, use the `generate-verifier-arguments` command:
+
+```sh
+cargo run -- generate-verifier-arguments -p <path_to_proof_file> -i <path_to_public_inputs_file>
+```
+
+**Example:**
+
+```sh
+cargo run -- generate-verifier-arguments -p tests/data/proof_of_twitter/proof.json -i tests/data/proof_of_twitter/public.json
+```