add contributing.md

Author: eleanorjboyd

contributing.md

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+## Getting Started
+
+```
+git clone https://github.com/microsoft/vscode-python-debugger
+cd vscode-python-debugger
+npm ci
+# Create virtual environment as appropriate for your shell or use the command "Python: Create Environment" in VS Code
+python3 -m venv .venv
+# Activate the virtual environment as appropriate for your shell like:
+# ".venv/Scripts/activate.bat"
+# On bash/zsh it's ...
+source .venv/bin/activate
+python3 -m pip install nox
+nox --session setup_repo
+```
+
+## Reporting Issues
+
+If you encounter any issues, please report them using the [GitHub Issues](https://github.com/microsoft/vscode-python-debugger/issues) page. Provide as much detail as possible, including steps to reproduce the issue and any relevant logs or screenshots.
+
+## Submitting Pull Requests
+
+1. Fork the repository and create your branch from `main`.
+2. If you've added code that should be tested, add tests.
+3. Ensure the test suite passes.
+4. Make sure your code passes lints and formatting requirements
+5. Submit a pull request.
+
+## Running Tests
+
+To run tests, use the following commands:
+
+```
+npm run compile-tests
+npm run test
+```
+
+Ensure all tests pass before submitting your pull request.
+
+## Coding Standards
+
+This project follows the coding standards and guidelines from the [vscode-python](https://github.com/microsoft/vscode-python/wiki/Coding#guidelines) repository. Please ensure your code adheres to these standards.
+
+## Code Formatting & Linting
+
+To check code formatting, run:
+
+```
+npm run format-check
+```
+
+To automatically fix formatting issues, run:
+
+```
+npm run format-fix
+```
+
+To lint your code, run:
+
+```
+npm run lint
+```
+
+Ensure there are no linting errors before submitting your pull request.
+
+## Python Code Linting and Formatting
+
+For Python code, this project uses `ruff` for linting and formatting. To check your Python code for linting and formatting issues, run:
+
+```
+ruff check .
+```
+
+To automatically fix formatting issues, run:
+
+```
+ruff --fix .
+```
+
+Ensure there are no linting or formatting errors before submitting your pull request.
+