Add CONTRIBUTING.md with Setup, Running the tests, and Submitting a pull request

CONTRIBUTING.md

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+# Contributing to ProofWorks
+
+Thank you for your interest in contributing to ProofWorks, a GenLayer escrow contract for GitHub bounty payouts.
+
+## Setup
+
+1. **Clone the repository**
+
+   ```bash
+   git clone https://github.com/tommycet/proofworks-genlayer.git
+   cd proofworks-genlayer
+   ```
+
+2. **Install Python dependencies**
+
+   The project requires Python 3.10 or later.
+
+   ```bash
+   pip install -r requirements.txt
+   ```
+
+3. **Set up the GenVM root**
+
+   The contract tests run inside a GenLayer simulated environment. Run the setup script to create a local GenVM root:
+
+   ```bash
+   make setup-genvmroot
+   ```
+
+   This creates a `.genvmroot` directory at the repository root with the GenLayer runtime and test infrastructure.
+
+4. **Install frontend dependencies** (optional, only needed for UI changes)
+
+   ```bash
+   make frontend-install
+   ```
+
+## Running the tests
+
+The project uses pytest with GenLayer's direct-mode test runner. All tests live under `tests/direct/` and cover one contract phase per file.
+
+Run the full test suite:
+
+```bash
+make test
+```
+
+This command runs `pytest -q` after ensuring the GenVM root is set up.
+
+For a complete validation pass that also lints the contract and builds the frontend:
+
+```bash
+make validate-all
+```
+
+## Submitting a pull request
+
+1. Fork this repository and create a feature branch from `main`.
+2. Make your changes and ensure all tests pass with `make test`.
+3. If you modified the Intelligent Contract (`contracts/proofworks_escrow.py`), run `make lint-contract` to verify it passes the GenVM linter.
+4. Commit your changes with a clear, descriptive message.
+5. Push your branch and open a pull request against the `main` branch of `tommycet/proofworks-genlayer`.
+6. In the PR description, reference any related issues and describe what your changes do and why.
+7. A maintainer will review your PR. CI checks (if configured) must pass before merging.