adding bubble sort program in cpp

[iamcodermonika26]

This pull request adds a Bubble Sort algorithm implementation in C++.

The code sorts an array of integers in ascending order.

Includes sample usage and output demonstration in main().

The implementation is straightforward and commented for readability.

Tested with sample input to verify correct sorting.

Reason for Change:
To provide a basic sorting function for educational or project purposes.

How to Test:
Compile and run the code provided in main(). Output should display the sorted array.