docs: add documentation for VerifierTest.sol

docs/VerifierTest.md

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+## Overview
+The `VerifierTest` contract provides comprehensive testing for the `Verifier` contract, focusing on verification mechanisms, signature validation, and edge case handling in a blockchain environment.
+
+## Interface
+
+| Function | Parameters | Returns | Description |
+|----------|------------|---------|-------------|
+| `setUp()` | None | None | Initializes test environment and contract instances |
+| `_generateTestPayload()` | `dataHash`, `privateKey` | `TestVerificationPayload` | Creates a test verification payload |
+| `_signMessage()` | `hash`, `privateKey` | `bytes` | Generates a cryptographic signature |
+| `testVerificationSubmission()` | None | None | Tests successful verification submission |
+| `testInvalidVerificationSignature()` | None | None | Validates signature rejection mechanism |
+| `testDuplicateVerification()` | None | None | Checks prevention of duplicate verifications |
+
+## Events
+- `VerificationSubmitted`: Emitted when a new verification is successfully submitted
+  - `dataHash`: Unique hash of verified data
+  - `submitter`: Address submitting the verification
+  - `timestamp`: Time of verification
+
+## Storage Layout
+- `verifier`: Instance of the Verifier contract
+- `owner`: Contract deployer address
+- `testUser`: Test user address for simulations
+
+## Access Control
+- Tests simulate different access scenarios
+- Uses `vm.prank()` to impersonate addresses
+- Validates signature-based access control
+
+## Security Considerations
+- Signature validation prevents unauthorized submissions
+- Prevents duplicate verifications
+- Uses cryptographic signing for verification
+- Implements input validation and error handling
+
+## Deployment
+- **Network**: ChunkNet Devnet
+- **RPC URL**: https://rpc.chunknet.org
+- **Chain ID**: 214562
+- **Recommended Deployment Steps**:
+  1. Set `CHUNK_CHAIN_RPC_URL` environment variable
+  2. Use Foundry/Hardhat with specified RPC configuration
+  3. Verify contract bytecode before deployment
+
+## Testing
+- Comprehensive test suite covering:
+  - Successful verification
+  - Signature validation
+  - Duplicate submission prevention
+- Uses Foundry's testing framework
+- Simulates various blockchain interaction scenarios