Add mouse_clicked usage example

[RUNQILIU-123]

Summary

This pull request adds an initial usage example for mouse_clicked in the input category.

Files added

• mouse_clicked-1-example.cpp
• mouse_clicked-1-example.py
• mouse_clicked-1-example-top-level.cs
• mouse_clicked-1-example-oop.cs
• mouse_clicked-1-example.txt
• mouse_clicked-1-example.png

What the example does

This example opens a window and places a red marker at the position of each left mouse click.

Testing

Tested by running:

• C++ version
• Python version

Verified that:

• the window opens correctly
• left mouse clicks are detected
• a marker appears at the clicked position

Notes

This is an interactive usage example for the mouse_clicked function in the input category.

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[ZGT23]

LGTM — the new mouse_clicked usage example is clear, practical, and renders correctly in the preview. The explanation, code samples, and output image work well together and make the feature easy to understand.

Just a small suggestion for future polish: it may be worth keeping the background handling fully consistent across all language variants, and, if applicable, mentioning C# explicitly in the testing section as well.

Approved from my side.