Add example users table

[ebrahimebrahim]

Add to the DVC example data an example users table with some users and roles in it. This will be useful for testing OpenwaterHealth/SlicerOpenLIFU#175

See the description of OpenwaterHealth/SlicerOpenLIFU#175 for information what kinds of user roles we want to include.

Depends on #203

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Traceability Information:

• Issue: OpenLIFU-python#204
• SOFTREQ: SlicerOpenLIFU#392
• Comment: This issue is related to the requirements defined in SlicerOpenLIFU#392.

This information was populated automatically by a script on 2025-06-09T18:02:16Z.