[README.md] Adding GithubActions setup information for developers.

[mmmarinho]

Main instructions

By submitting this pull request, you automatically agree that you have read and accepted the following conditions:

• Anyone wanting to propose a new modification or introduce new functionality should reach out to the team first, as proposed modifications that do not comply with the library's development philosophy and style, do not follow the library's architecture, do not introduce a clear and general benefit to the library other than to the person who proposed the modification will likely be rejected with no further discussion.
• Support for DQ Robotics is given voluntarily and it is not the developers' role to educate and/or convince anyone of their vision.
• Any possible response and its timeliness will be based on the relevance, accuracy, and politeness of a request and the following discussion.
• You are familiar with the development workflow.
• Each pull request should contain only individual changes (several changes of the same type are allowed on the same pull request).
• Refactoring or modifying internal implementation that is working is not allowed unless comprehensively discussed with and approved by @bvadorno and @mmmarinho.

Description of changes

Proposing changes to the README.md so that the @dqrobotics/developers can set up a self-hosted runner to perform the continuous integration of the MATLAB version of dqrobotics.

@juanjqo: Please check and help me fill in the information well. This pull request will be a draft until the information herein is double-checked.

[juanjqo]

Hi @mmmarinho,

Happy to help! It looks like I am not allowed to access the actions/runners.

[bvadorno]

Hi @mmmarinho,

Happy to help! It looks like I am not allowed to access the actions/runners.

I gave you admin privileges to the MATLAB repository. You should be able to access the runners now.

[juanjqo]

Hi @mmmarinho,

The instructions are precise and work.

Kind regards,

Juancho