Add instructions for downloading with VSCode

[WasabiFan]

We should do the same thing that was done with the vscode-hello-python repository and include instructions for downloading the demos to your local PC and then deploying/running then with VSCode. I think it would make sense to move the usage instructions to the Wiki on this repo and then link to all pages we have as options for deployment.

If we want to support debugging the demos as well, this would probably also include checking in VSCode launch files for each demo.