Animate congruence of arcs for students

[pdeva04]

Motivation

This PR introduces a new Manim animation designed to clearly explain "Congruence of Arcs," specifically tailored for students who find this topic confusing. It enhances the library by providing a comprehensive, visually engaging, and educational resource.

Proposed changes

• Added congruent_arcs_animation.py: The core Manim animation with 7 detailed scenes explaining arc congruence.
• Added CONGRUENT_ARCS_README.md: Provides a comprehensive overview, features, and usage instructions for the animation.
• Added INSTALLATION_GUIDE.md: A step-by-step guide for setting up Manim to run the animation on various platforms.
• Added PROJECT_SUMMARY.md: Summarizes the project deliverables, features, and validation results.
• Added test_animation_structure.py: A utility script to validate the animation's code structure and educational features.

Test

Code:

python3 test_animation_structure.py
manimgl congruent_arcs_animation.py CongruenceOfArcs

Result:
The test_animation_structure.py script confirmed that the animation's structure is valid, all 7 scenes are properly implemented, and educational features are present. The animation is ready to be rendered using Manim.

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