Video Demonstrations for all Ros2 Tutorials

还没有人认领这个 Issue。

### Concept
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For all the tutorials we must have a **video** at the bottom of the page that show
*how you can perform the above tutorial*.

### Previous Experience
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I saw a lot of beginners show resistance to linux/terminal . I posted a video in ROS1 Noetic **Nodes tutorial** , People really **loved it** and even reached out to me to produce more .

### Process
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It would be great for starters to have a **video to follow** by utilizing contents of written tutorials + **some additional explanation** .

### Who will do it ?
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I can do it , I mean i will be really happy to give back to ROS2 for what good it has brought in to my career.
If any one would like to join in -> I will be great full .

该 issue 没有指定文件、教程入口或测试位置。首先盘点此 repository 中的 ROS2 教程，并确定页面目前如何嵌入媒体；完成的标准是每个教程底部都有一个遵循文字步骤并补充说明的视频。

由索引模型根据 Issue 内容生成。