Added Matrix_Chain_Multiplication DP Problem

[ayushig2610]

Related Issue

• Info about the related issue

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

Describe the changes you've made

Give a clear description what modifications you have made

Mention any unusual behaviour of your code (Write NA if not)

Any unusual behaviour of your code

Checklist:

(To mark, write x inside the square brackets like this: [x])

• 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.

Additional Info (optional)

Any additional information you want to give

[kanak22]

@ayushig2610 Link the issue