Create CONTRIBUTING.md

Author: loreabad6

CONTRIBUTING.md

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+# How to contribute?
+
+We look very much forward to contributions to the package. This can be done in several ways:
+
+- Create a pull request with a specific feature implementation or bug fix.
+- Open an issue in the [issue tracker](https://github.com/SliDEM-project/SliDEM-python/issues) to request a specific feature or report a bug. Please use and follow the issue templates.
+
+## Code of conduct
+
+This project is released with a [Contributor Code of Conduct](CODE_OF_CONDUCT.md). By participating in this project you agree to abide by its terms.