Create CONTRIBUTING.md

Author: david96182

CONTRIBUTING.md

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+# Contributing to Ninjemail
+
+Thank you for considering contributing to Ninjemail! This document provides guidelines on how to contribute to this project.
+
+### Setting Up Your Development Environment
+
+1. **Fork the Repository**: Go to the [project repository](https://github.com/david96182/ninjemail) and click on the "Fork" button at the top right corner. This will create a copy of the repository in your GitHub account.
+2. **Clone Your Fork**: Clone your forked repository to your local machine. Replace `yourusername` with your GitHub username and `yourproject` with the name of your project.
+3. **Project installation**: Follow the project [installation steps](https://github.com/david96182/ninjemail?tab=readme-ov-file#installation).
+
+## Issue Reporting
+
+If you find a bug or have a feature request, please open an issue on the [issue tracker](https://github.com/david96182/ninjemail/issues). When filing an issue, make sure to:
+
+- Provide a clear and descriptive title.
+- Describe the issue in as much detail as possible.
+- Include steps to reproduce the issue.
+- Mention the configuration of the project you're using.
+
+## Pull Requests
+
+If you've made changes that you'd like to contribute back to the project, you can open a pull request. Here's how:
+1. **Fork the Repository**: If you haven't already, fork the repository.
+2. **Create a New Branch**: Create a new branch for your changes. It's a good practice to name your branch according to the issue you're addressing.
+3. **Commit Your Changes**: Commit your changes with a clear and descriptive commit message.
+4. **Push Your Changes**: Push your changes to your forked repository.
+5. **Open a Pull Request**: Go to your forked repository on GitHub and click on the "New pull request" button.
+
+## Code Style
+
+When contributing code, please follow the project's code style. This might include:
+
+- Indentation and spacing
+- Naming conventions
+- Comment style
+
+## Testing
+
+If your contribution includes code changes, please include tests that cover your changes. This helps ensure that your changes work as expected and don't introduce new issues.
+
+## Documentation
+
+If your contribution includes new features or changes to existing features, please update the documentation accordingly. This includes the README files and any other relevant documentation.
+
+## License
+
+By contributing to Ninjemail, you agree that your contributions will be licensed under its [LICENSE](LICENSE).
+
+---
+
+Thank you for contributing to [Your Project Name]! We look forward to your contributions.