Support for OpenVSX

[jsta]

I would love to try this extension. However I am a VSCodium user and can only pull from the Open VSX store (https://open-vsx.org/). Any chance you would be willing to upload there?

[krodelabestiole]

I second this : https://github.com/VSCodium/vscodium/blob/master/DOCS.md#extensions--marketplace

Though I've just noticed the vsix file can be downloaded from the microsoft repo : https://marketplace.visualstudio.com/items?itemName=SantaCodes.santacodes-region-viewer

codium --install-extension SantaCodes.santacodes-region-viewer-1.1.1.vsix