Priority queues is missing

[axshivam]

We can implement max heap, min-heap. It is used whenever we wish efficiently find the minimum or maximum element.
Can I add this algo?

[Priyanshi-Chauhan]

I saw the priority queues folder, it is missing heapify implementation. Can I make my first contribution by adding implementing heapify and using that heapify function in inplace heapsort

[gabriellecannella]

Working on this!