Register the VSCode extension also in the VSCodium registery

VSCodium gets its extensions from this registry https://open-vsx.org.  This issue is to register the apio vscode registry also at https://open-vsx.org. It seems to have a feature of one time registration and then continuous updates from the Microsoft registry. 

https://github.com/EclipseFdn/open-vsx.org/wiki/Auto-Publishing-Extensions