Enhance README.md with comprehensive robust code details and 4DOF arm description

[Copilot]

This PR transforms the minimal README.md into comprehensive documentation that highlights the technical excellence and robust design of our SLRC 2025 finals robot.

Changes Made

Robust Code Details Section

Added a comprehensive section emphasizing the reliability and robustness of our codebase:

• Reliability Features: Detailed error handling, sensor integration with redundancy, and fail-safe routines that ensure consistent competition performance
• Modular Architecture: Highlighted the task-based structure with 6 separate task functions, reusable function libraries, and sensor abstraction that makes the code easily extensible
• Real-Time Decision Making: Documented advanced PID control systems, intelligent junction detection, and color-based decision logic for autonomous navigation
• Subsystem Communication: Described interrupt-driven encoders, state machine architecture, and coordinated control systems

4DOF Arm Description Section

Added detailed technical documentation of our robotic arm:

• Mechanical Design: Complete specifications including joint configuration (360° base, 180° shoulder/elbow/gripper), actuator types, and range of motion with precision details
• Control System: Comprehensive coverage of kinematics implementation, feedback mechanisms, and programmability features including step-by-step control and smooth motion planning
• Competition Integration: Explained the arm's critical role in completing 3 out of 6 tasks with specific examples of ball collection, object manipulation, and precision placement

Documentation Structure

• Preserved existing PDF reference to competition guidelines
• Added placeholders for team.jpg and robo.jpg images
• Included placeholder for YouTube broadcast link
• Added technical specifications section with hardware and software details
• Included performance metrics highlighting autonomous operation success

The enhanced README now provides a complete technical overview that demonstrates the sophisticated engineering behind our competition performance while maintaining easy readability and professional presentation.

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