doc: add a simple CONTRIBUTING.md

Author: franckgaga

CONTRIBUTING.md

@@ -0,0 +1,31 @@
+# Contributing
+
+Thank you for your interest in contributing! This document provides guidelines for
+contributing to the project. If you have a problem to report or improvement to suggest
+please open an issue or open a pull request. To do so, please follow the instructions below.
+
+## Reporting Issues
+
+- Use GitHub Issues for bug reports and feature requests
+- Include a minimal reproducible example for bugs
+- Specify Julia version and package environment details
+
+## Pull Requests
+
+- Fork the repository and create a new branch for your changes
+- Write clear commit messages describing your changes
+- Ensure your code follows the project's coding style (see below)
+- Include tests for new features or bug fixes
+- Update documentation if necessary
+
+## Code Style
+
+- Try to follow the [Julia style guide](https://docs.julialang.org/en/v1/manual/style-guide/)
+- Use meaningful variable and function names
+- Mathematical symbols and unicode characters as variable names are encouraged if they are
+  properly introduced in the documentation
+- Add docstrings to public functions using the standard Julia format
+
+## Questions?
+
+Feel free to open an issue or discussion if you have questions about contributing!