Description of Change

This PR adds a C++ implementation of Neville's Algorithm for polynomial interpolation. The algorithm is placed in the numerical_methods directory.

The implementation includes:

• A function interpolate() within a dedicated namespace.
• Doxygen-style comments explaining the file, function, and parameters.
• A test() function with assertions to verify correctness for linear, quadratic, and negative-valued cases.

Wikipedia: https://en.wikipedia.org/wiki/Neville%27s_algorithm

Checklist

• Added description of change
• Added file name matches File name guidelines (nevilles_algorithm.cpp)
• 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 an implementation of Neville's algorithm for polynomial interpolation.