Create CONTRIBUTING.md

Author: juanmc2005

CONTRIBUTING.md

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+# Contributing to diart
+
+Thank you for considering contributing to diart! We appreciate your time and effort to help make this project better.
+
+## Before You Start
+
+1. **Search for Existing Issues or Discussions:**
+   - Before opening a new issue or discussion, please check if there's already an existing one related to your topic. This helps avoid duplicates and keeps discussions centralized.
+
+2. **Discuss Your Contribution:**
+   - If you plan to make a significant change, it's advisable to discuss it in an issue first. This ensures that your contribution aligns with the project's goals and avoids duplicated efforts.
+
+3. **Questions about diart:**
+   - For general questions about diart, use the discussion space on GitHub. This helps in fostering a collaborative environment and encourages knowledge-sharing.
+
+## Opening Issues
+
+If you encounter a problem with diart or want to suggest an improvement, please follow these guidelines when opening an issue:
+
+- **Bug Reports:**
+  - Clearly describe the error, including any relevant stack traces.
+  - Provide a minimal, reproducible example that demonstrates the issue.
+  - Mention the version of diart you are using (as well as any dependencies related to the bug).
+
+- **Feature Requests:**
+  - Clearly outline the new feature you are proposing.
+  - Explain how it would benefit the project.
+
+## Opening Pull Requests
+
+We welcome and appreciate contributions! To ensure a smooth review process, please follow these guidelines when opening a pull request:
+
+- **Create a Branch:**
+  - Work on your changes in a dedicated branch created from `develop`.
+
+- **Commit Messages:**
+  - Write clear and concise commit messages, explaining the purpose of each change.
+
+- **Documentation:**
+  - Update documentation when introducing new features or making changes that impact existing functionality.
+
+- **Tests:**
+  - If applicable, add or update tests to cover your changes.
+
+- **Code Style:**
+  - Follow the existing coding style of the project. We use `black` and `isort`.
+
+- **Discuss Before Major Changes:**
+  - If your PR includes significant changes, discuss it in an issue first.
+ 
+- **Follow the existing workflow:**
+  - Make sure to open your PR against `develop` (**not** `main`).
+
+## Thank You
+
+Your contributions make diart better for everyone. Thank you for your time and dedication!
+
+Happy coding!