Added contribution guidelines

CONTRIBUTING.md

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+# `zon` Contribution Guidelines
+
+This document contains the contribution guidelines for the `zon` project. All contributions will be welcome, but they should follow the guidelines described in this document.
+
+## Table of Contents
+
+- [`zon` Contribution Guidelines](#zon-contribution-guidelines)
+  - [Table of Contents](#table-of-contents)
+  - [Code of Conduct](#code-of-conduct)
+  - [Issues](#issues)
+  - [Pull Requests](#pull-requests)
+
+## Code of Conduct
+
+This project adheres to the [Contributor Covenant Code of Conduct](https://www.contributor-covenant.org/version/2/0/code_of_conduct/). By participating, you are expected to uphold this code. Please report unacceptable behavior to 
+
+## Issues
+
+Issues should be used to report bugs, request features, or discuss changes in existing features. When creating an issue, please follow the guidelines below:
+
+- **Bug reports** should include a short summary of the bug, a description of the expected behavior, and a description of the actual behavior. If possible, please include a minimal code sample that reproduces the bug.
+- **Feature requests** should include a short summary of the feature, a description of the motivation behind the feature, and a description of the proposed implementation.
+- **Changes in existing features** should include a short summary of the change, a description of the motivation behind the change, and a description of the proposed implementation.
+- **Questions** should include a short summary of the question, a description of the context in which the question arose, and a description of the desired outcome.
+- **General discussions** should include a short summary of the topic, a description of the context in which the topic arose, and a description of the desired outcome.
+- **Other issues** should include a short summary of the issue, a description of the context in which the issue arose, and a description of the desired outcome.
+- **All issues** should be tagged with the appropriate labels. If you are unsure about which labels to use, please use the `help wanted` label.
+
+## Pull Requests
+
+Pull requests should be used to propose changes to the codebase. When creating a pull request, please follow the guidelines below:
+
+- **Bug fixes** should include a short summary of the bug, a description of the expected behavior, and a description of the actual behavior. If possible, please include a minimal code sample that reproduces the bug.
+- **New features** should include a short summary of the feature, a description of the motivation behind the feature, and a description of the proposed implementation.
+- **Changes in existing features** should include a short summary of the change, a description of the motivation behind the change, and a description of the proposed implementation.
+- **All pull requests** should be tagged with the appropriate labels. If you are unsure about which labels to use, please use the `help wanted` label.
+- **All pull requests** should (but are not strictly required to) be accompanied by a description of the alternatives considered when making the changes in the pull request.
+

CONTRIBUTORS

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+Nuno Pereira <nunoafonso2002@gmail.com>

README.md

@@ -146,7 +146,9 @@ pytest /test
 
 ## Contributing
 
-No contribution guidelines are available yet, but they will be soon.
+Contribution guidelines can be found in [CONTRIBUTING](CONTRIBUTING.md)
+
+Past and current contributors can be found in [CONTRIBUTORS](CONTRIBUTORS.md)
 
 ## License