Add triangles intersect usage example

[ekam313]

Description

This pull request adds a new SplashKit usage example for the
triangles_intersect function in the Geometry category.

The example displays one fixed triangle and one triangle that follows the
mouse. The program continuously checks whether the two triangles intersect.
The moving triangle and the displayed message change depending on the boolean
result returned by triangles_intersect.

The example is implemented consistently in C++, C# top-level statements,
C# object-oriented format, and Python. A descriptive title and GIF are also
included.

No additional dependencies are required.

Type of change

• New feature (non-breaking change which adds functionality)
• Documentation (update or new)

How Has This Been Tested?

All four code versions were run locally. The following behaviour was verified:

• The fixed triangle displays correctly.
• The moving triangle follows the mouse.
• The program correctly detects intersecting triangles.
• The program correctly detects non-intersecting triangles.
• The displayed colour and text update correctly.
• The program closes without errors.

The website was also built and previewed locally to confirm that the example
appears under the correct function and that the GIF and code files display
correctly.

Testing Checklist

• Tested in latest Chrome
• Tested in latest Firefox
• npm run build
• npm run preview

Checklist

If involving code

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

Folders and Files Added/Modified

• Added:
  • public/usage-examples/geometry/triangles_intersect-1-example.cpp
  • public/usage-examples/geometry/triangles_intersect-1-example-top-level.cs
  • public/usage-examples/geometry/triangles_intersect-1-example-oop.cs
  • public/usage-examples/geometry/triangles_intersect-1-example.py
  • public/usage-examples/geometry/triangles_intersect-1-example.txt
  • public/usage-examples/geometry/triangles_intersect-1-example.gif

Additional Notes

The GIF demonstrates both the intersecting and non-intersecting states by moving
the second triangle with the mouse.

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[Osaid2993]

@ekam313, Please remove the comments that only repeat the code, such as:

• Define a fixed triangle
• Create a triangle that follows the mouse
• Check whether the triangles intersect

Comments should explain why, not restate the code. Please update this consistently across all four versions.

[AAMIRAU]

The example itself looks good and the intersection behaviour is clearly demonstrated. I noticed the previously requested cleanup of comments that only restate the code is still pending across the language versions. Once those comments are removed or updated, this should be good to go.