Merge Sort algorithm implementation

[suzan-rana]

Hello, I would like to contribute by implementing a merge sort algorithm, an algorithm that follows divide and conquer strategy, having time complexity as O(n log n)

[suzan-rana]

@puruagarwal1 please assign this to me, I would like to contribute

[Jugnu-Gupta]

@puruagarwal1 please assign this task to me,
i have good knowledge of DSA.
Merge sort is based on divide and conquer.

[saku1331]

I wish to contribute. Kindly assign this to me.

[Pritee668]

please assign this to me