Added chain matrix multipliaction (problem) in the dynamic programming section

[Nyctophiliac1918]

This program will return the minimum number of multiplications needed to multiply the chain of matrices. Matrices A, B, C, D can be multiplied in ways such as (ABC)D, (AB)(CD), A(BC)D, etc. So, for finding the method with the minimum number of multiplications, this functions proves to be useful.

[github-actions]

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[stale]

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