Add example dataset to use with GUI

[ortk95]

Pull request checklist

• [x] Add a clear description of the change
• [ ] Add any new tests needed
• [x] Run spell check on new text visible to user (documentation, GUI etc.)
• [ ] Check any changes to requirements.txt are reflected in setup.py
• [ ] Check code passes CI checks (run run_ci.sh or check GitHub Actions)

See CONTRIBUTING.md for more details.

[coveralls]

Pull Request Test Coverage Report for Build 5963157265

• 2 of 2 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 99.496%

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Totals
Change from base Build 5671298444:	0.0%
Covered Lines:	2741
Relevant Lines:	2755

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💛 - Coveralls