Added window_caption usage example

[Nadiazahan]

Description

SplashKit Function: window_caption

Overview of example functionality:
This example demonstrates how to use the window_caption function to retrieve the caption text of a window. It provides a beginner-friendly example showing how to open a window, store it in a variable, get the caption using window_caption(window), and display the returned text on the screen.

Example Output:

Files Included

• C++ code
• C# code (Top-Level statements)
• C# code (Object-Oriented Programming)
• Python code
• Relevant title for the example (.txt)
• Screenshot

Usage Example Checks

• Code uses SplashKit function above
• Code does not use non-SplashKit functions
• Code does not use extra function declarations or extra classes
• Code does not violate any of the Thoth Tech SplashKit Style Guide rules
• Simple, clear demonstration of the function
• Tested in Chrome

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