docs: add english contributing guide

Author: SergioRibera

CONTRIBUTING_EN.md

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+# Contributing to the LeetCode Daily Challenge Worker
+
+Thank you for your interest in contributing to this project! Below are the guidelines for contributing effectively.
+
+## Code of Conduct
+
+When participating in this project, it is expected that you follow our [Code of Conduct](LINK_TO_CODE_OF_CONDUCT). Please read it and respect it in all your interactions.
+
+## Issues
+
+If you find a bug or have a suggestion to improve the project, you can open a new issue in the repository. Please provide clear and concise details about the problem or suggestion.
+
+## Pull Requests (PRs)
+
+1. Fork the repository and create a new branch for your changes.
+2. Make your modifications and ensure that the code follows style guidelines and all tests pass.
+3. Write tests for your new or updated code.
+4. Update the documentation if necessary.
+5. Create a pull request from your branch to the main branch of the original repository.
+6. Provide a clear and concise description of your changes.
+7. Ensure that your pull request passes all required tests and code reviews.
+
+## Code Style
+
+This project follows Rust's code style guidelines. Please ensure that your contributions adhere to these guidelines.
+
+## Tests
+
+All contributions must include tests to ensure code quality. Make sure your tests cover relevant use cases and pass before submitting a pull request.
+
+## Documentation
+
+If your contribution involves changes to the documentation, please update it accordingly. Keeping documentation clear and up-to-date is crucial for understanding and maintaining the project.
+
+## License
+
+By contributing to this project, you agree that your contributions will be licensed under the [MIT LICENSE](./LICENSE-MIT) of the project.
+
+Thank you for your interest in contributing to this project! We look forward to your contributions.