Can't find any of the "real application packages" referenced in the top-level README.md file

Personne n'a encore pris cette issue.

## Issue template

- Version or commit hash: galactic branch

#### Steps to reproduce the issue
In [README.md](https://github.com/micro-ROS/micro-ROS-demos/tree/galactic#real-application-packages), there is reference to the following packages:
- [rad0_actuator](https://github.com/micro-ROS/micro-ROS-demos/tree/galactic#rad0_actuator)
- [rad0_altitude_sensor](https://github.com/micro-ROS/micro-ROS-demos/tree/galactic#rad0_altitude_sensor)
- [rad0_control](https://github.com/micro-ROS/micro-ROS-demos/tree/galactic#rad0_control)
- [rad0_display](https://github.com/micro-ROS/micro-ROS-demos/tree/galactic#rad0_display)

However, I can't seem to find that code anywhere. Would you mind adding github links to the corresponding source files for those sections?

The only package I see that seems related is the [RAD0_control](https://github.com/micro-ROS/micro-ROS-demos/tree/galactic/rclcpp/RAD0_control) package, but that doesn't have any of the functionality referenced above.

Examinez la section Real Application Packages de README.md et comparez ses références à rad0_actuator, rad0_altitude_sensor, rad0_control et rad0_display avec le contenu du dépôt. Vérifiez le package rclcpp/RAD0_control existant, puis mettez à jour la section avec des liens vers les emplacements sources correspondants ou avec des références correctes afin que chaque package listé soit identifiable.

Rédigé par le modèle d'indexation à partir du texte de l'issue.