Address Issue 2971 - Created Ropes Implementation

[sgupta1703]

Description of Change

Implemented the Rope data structure, a binary tree-based alternative to strings, optimized for efficient concatenation, insertion, deletion, and substring operations.

The new file ropes.cpp includes:

• Full implementation of the Rope class
• Unit tests to verify correctness
• Example usage demonstrating concatenation, insertion, deletion, and substring extraction
• Detailed documentation and comments following Doxygen style for educational clarity

Checklist

• Added description of change
• Added file name matches File name guidelines
• Added tests and example, test must pass
• Added documentation so that the program is self-explanatory and educational – Doxygen guidelines
• Relevant documentation/comments is changed or added
• PR title follows semantic commit guidelines
• Search previous suggestions before making a new one, as yours may be a duplicate
• I acknowledge that all my contributions will be made under the project's license

Notes

Adds a Rope data structure implementation including unit tests and a demonstration, with detailed comments for educational clarity.