Need this program written in C++ with clear and detailed documentation

Option A-Page 139 Problem 7 If A and B are two m x n matrices, their sum is defined as follows: If Aj and Bij are the entries in the ith row and jth column of A and B respectively, then Aij + Bij is the entry in the ith row and jth column of their su, which will also be an m x n matrix. Write a program to create and have the user fill two static matrices, create a third static matrix that represents the sum A and B, and display that matrix. Thus, if matrix A is: 1 2 3 4 and matrix B is 2 3 4 5 then matrix C would be calculated to be: 3 5 7 9