[Algo] Quick Sort [C++]

[joao-p-marques]

Hi!
Can you assign this to me, please?

[sangamcse]

GitMate.io thinks possibly related issues are #222 ([Algo] Radix Sort [C++]), #20 ([Algo]: Add Bubble Sort in C++), #45 ([Algo] Binary Search [C++]), #22 ([Algo]: Add Heapsort in C++), and #62 ([Algo] Insertion Sort [C++]).