Add licensed example scans and expected outputs

[Jayktopus]

Goal

Give new users small, redistributable examples that demonstrate expected input and output.

Acceptance criteria

• Add at least one simple outer contour and one part with a hole.
• Include source or generation details and an explicit licence.
• Document DPI, calibration and expected dimensions.
• Include a screenshot or expected contour result.
• Avoid personal information and proprietary parts.