To add "Maximum Rectangle in histogram" problem

[Amit-yadav099]

hello @Pradeepsingh61
I want to constribute in your c++ code collection by adding the problem "maimum rectangke in histrogram"
as a newbie in contribution , kindly assign it task to me under hacktoberfest2024 .

problem statement:-
Given an array of integers heights representing the histogram's bar height where the width of each bar is 1, return the area of the largest rectangle in the histogram.

Input: heights = [2,1,5,6,2,3]
Output: 10
Explanation: The above is a histogram where width of each bar is 1.
The largest rectangle is shown in the red area, which has an area = 10 units.