Create high level overview doc for MVUX

[dr1rrb]

closes https://github.com/unoplatform/uno.extensions-private/issues/195

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PR Checklist

Please check if your PR fulfills the following requirements:

• [ ] Tested code with current supported SDKs
• [ ] Docs have been added/updated which fit documentation template. (for bug fixes / features)
• [ ] Unit Tests and/or UI Tests for the changes have been added (for bug fixes / features) (if applicable)
• [ ] Wasm UI Tests are not showing unexpected any differences. Validate PR Screenshots Compare Test Run results.
• [ ] Contains NO breaking changes
• [ ] Updated the Release Notes
• [ ] Associated with an issue (GitHub or internal)

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[nickrandolph]

This is approved but would like to see if we can add the image from marketing that shows the flow.

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[agneszitte]

@jeromelaban / @nickrandolph / @dr1rrb What is left for this PR please?

[kazo0]

@dr1rrb is this PR still valid? Is it something we should be merging?