Adding the Rhodonite View to the gltf-vscode plugin

[emadurandal]

I forked the https://github.com/AnalyticalGraphicsInc/gltf-vscode as https://github.com/actnwit/gltf-vscode

Let's add our library for it.

ref: https://github.com/AnalyticalGraphicsInc/gltf-vscode/blob/aecc2b7c10199c988de5bb07c059d8c1c221d187/pages/previewModel.js

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