Create CONTRIBUTING.md

Author: alisinabh

CONTRIBUTING.md

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+# Contributing to Elixir Ethers
+
+Thank you for your interest in contributing to Elixir Ethers! We welcome contributions from the community.
+
+## How to Contribute
+
+1. Fork the repository
+2. Create a new branch for your feature or bugfix (`git checkout -b your-feature-name`)
+3. Make your changes
+4. Run the test suite (`mix test`)
+5. Ensure code formatting is correct (`mix format`)
+6. Commit your changes with a descriptive commit message
+7. Push to your fork
+8. Open a Pull Request
+
+## Development Setup
+
+1. Ensure you have Elixir installed
+2. Clone the repository
+3. Install and Run `anvil` (From https://getfoundry.sh/)
+4. Install dependencies with `mix deps.get`
+5. Run tests with `mix test`
+
+## Pull Request Guidelines
+
+- Include tests for any new functionality
+- Update documentation as needed
+- Follow the existing code style
+- Keep your changes focused and atomic
+- Write clear commit messages
+
+## Questions or Issues?
+
+If you have questions or run into issues, please open a GitHub issue with a clear description of the problem or question.
+
+## License
+
+By contributing to Elixir Ethers, you agree that your contributions will be licensed under its [License](/LICENSE).