docs: add initial contribution guide

CONTRIBUTING.md

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+# Contributing to Effect Lambda
+
+Thank you for considering contributing to Effect Lambda! Contributions from the community are welcome, excited to see what you can bring to the project.
+
+## How to Contribute
+
+1. **Fork the Repository**: Start by forking the repository to your GitHub account.
+
+2. **Clone Your Fork**: Clone your forked repository to your local machine.
+
+   ```bash
+   git clone https://github.com/your-username/effect-lambda.git
+   ```
+
+3. **Create a Branch**: Create a new branch for your feature or bug fix.
+
+   ```bash
+   git checkout -b feature/your-feature-name
+   ```
+
+4. **Install Dependencies**: Ensure you have all necessary dependencies installed.
+
+   The project is using [projen](https://projen.io/) to manage tooling. To install the dependencies, run:
+
+   ```bash
+   pnpm install && npx projen
+   ```
+
+5. **Make Changes**: Implement your changes using a functional programming approach. Ensure your code is clean, well-organized, and adheres to the project's coding standards.
+
+6. **Run Tests**: Before submitting your changes, run the test suite to ensure everything is working correctly.
+
+   ```bash
+   pnpm test
+   ```
+
+7. **Commit Your Changes**: Commit your changes with a clear and descriptive commit message.
+
+   Please follow the [conventional commit](https://www.conventionalcommits.org/en/v1.0.0/) message format when committing your changes
+
+   ```bash
+   git commit -m "Add feature: description of feature"
+   ```
+
+8. **Push Your Branch**: Push your branch to your forked repository.
+
+   ```bash
+   git push origin feature/your-feature-name
+   ```
+
+9. **Open a Pull Request**: Go to the original repository and open a pull request. Provide a clear description of your changes and any additional context that might be helpful.
+
+## Reporting Issues
+
+If you encounter any issues or have questions, please open an issue on GitHub. Provide as much detail as possible to help us understand and resolve the issue.
+
+## License
+
+By contributing to Effect Lambda, you agree that your contributions will be licensed under the Apache License 2.0.
+
+Thank you for your contributions!