Add demos with plumber and Shiny about rocker-win HOT 1 CLOSED

The string execution of Windows Containers really gave me a hard time here, because it seems they do not distinguish really well between " and '. This seems to be my lack of knowledge of using R on Windows:

PS C:\Users\d_nues01> R.exe -e "library('shiny'); runExample('01_hello')"
Der Befehl "C:\PROGRA~1\R\R-34~1.3\bin\x64\R.exe" -e "library" ist entweder falsch geschrieben oder
konnte nicht gefunden werden.

The quirks of powershell escaping might be the root problem: https://stackoverflow.com/questions/18116186/escaping-quotes-and-double-quotes

Solved by using Rscript.exe, more than one -e, and _not putting spaces around ,port=1234. No idea which one did the trick.

from rocker-win.