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

还没有人认领这个 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.

检查 README.md 中的 Real Application Packages 部分，并将其中对 rad0_actuator、rad0_altitude_sensor、rad0_control 和 rad0_display 的引用与仓库内容进行对照。检查现有的 rclcpp/RAD0_control 软件包，然后使用指向相应源代码位置的链接或正确的引用更新该部分，以便能够找到其中列出的每个软件包。

由索引模型根据 Issue 内容生成。