Add screnshots

[noci0001]

In order to digest the text better I took a lot of screenshots to show even more clearly the different steps of the process to set up the companion application.

[noci0001]

If you want to use them if could be good place them inside the folder companion-app-screenshots. That way all the links will work.

[eriksven]

@noci0001 in genreal, I like the idea with the screenshot. Can I simply re-use your screenshots for the guide? I was a bit cautious with screenshots in the past especially of external systems like GitHub or the DevContainer because these services might introduce changes to their UI over time which is harder to keep track of and can be very confusing in the end.

[noci0001]

Yes you can use my screenshots no problem