Draft: Add demo video clip to README

We could easily add a video file to the repo and reference that in the README, but this will significantly increase the repository's size.

It seems that it somewhat difficult to add an external meeting, but maybe I am overlooking something.

README.md

 # ArmarX Setup
 
-Setup and maintenance tools for ArmarX and its dependencies.
+Setup and maintenance tool for ArmarX and its dependencies.
+
+[![asciicast](https://asciinema.org/a/PTNxyCzQFIPhZc0aZr5DsPqFI.svg)](https://asciinema.org/a/PTNxyCzQFIPhZc0aZr5DsPqFI)
 
 
 ## Setup