Add moving circle example demonstrating basic animation

[thealokverse]

Added a simple shapes example demonstrating basic animation using a moving circle.

This example shows how to:

• Move an object using GetFrameTime()
• Implement basic frame-based animation
• Create smooth motion independent of FPS

The example follows the existing raylib structure and is intended to help beginners understand animation fundamentals.

[raysan5]

@thealokverse thanks but there is already a very similar example, I prefer to minimize duplicates.

[thealokverse]

got it, thanks for the clarification.