feat: Create a C++ Program to Check Kaprekar Number for Specific Base

[purnasth]

Issue Title: Create C++ Program to Check Kaprekar Number for Specific Base

Issue Description:

I propose to contribute a C++ program that checks whether a given number is a Kaprekar number for a specific base. Kaprekar numbers are a fascinating mathematical concept, and providing a C++ program to identify them for a specified base will be a valuable addition to our collection of C and C++ programs.

Program Details (if available):

If there are specific details or requirements for the C++ program, please provide them to ensure it aligns with the project's goals.

I am excited to work on this and contribute to our growing collection of C and C++ programs.