chore: add contributing guide

Author: Apolo151

CONTRIBUTING.md

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+<a href="https://mmg-ai.com/en/"><img src="https://jderobot.github.io/assets/images/logo.png" width="100 " align="right" /></a>
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+# Contributing to RoboticsAcademy
+
+First off, thanks for your interest in contributing to RoboticsInfrastructure! All contributors are welcome, from commenting issues to reviewing or sending Pull Requests.
+
+## How to contribute?
+
+If you are new to GitHub, visit the [first-contributions instructions](https://github.com/firstcontributions/first-contributions/blob/master/README.md) to learn how to contribute on GitHub.
+
+To find issues you can help with, go though the list of [good first issues](https://github.com/JdeRobot/RoboticsInfrastructure/issues?q=is%3Aissue%20state%3Aopen%20label%3A%22good%20first%20issue%22) or issues labeled with [help wanted](https://github.com/JdeRobot/RoboticsInfrastructure/issues?q=is%3Aissue%20state%3Aopen%20label%3A%22help%20wanted%22).
+
+Once found or created an issue, let us know that you want to work on it by commenting in the issue.
+
+Please, make sure to follow our [coding style guide](https://github.com/JdeRobot/RoboticsAcademy/blob/humble-devel/docs/coding_style_guide.md) while working.