Added Matrix_Chain_Multiplication DP Problem

[ayushig2610]

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Closes: #[issue number that will be closed through this PR]

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• [ ] My code follows the guidelines of this project.
• [ ] I have performed a self-review of my own code.
• [ ] I have commented my code, particularly whereever it was hard to understand.
• [ ] My changes generate no new warnings.

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[kanak22]

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