Move AutoGrid control demo to this repo

[maxkatz6]

Topics to cover

We have AutoGrid control created as a sample. It makes a little use as an independent control but is a great example of how to create custom panel-like control.
https://github.com/AvaloniaUI/AvaloniaAutoGrid

Would be great if we move it to this repo and archive the initial one.

[timunie]

@maxkatz6 that's a good idea 👍 . I'll take a deeper look into it as soon as I have time to do.