[DS] Priority Queue (Heap) in Javascript

[ckpiyanon]

Data Structure

• [🗸] I have gone through the repository and made sure this data structure has not been implemented

Information about my new data structure

• Data Structure: Priority Queue (Max Heap)

• Programming Language: Javascript

Is this your first contribution to this repository? Yes

[xitter]

@ckpiyanon I would like to work on this, could you assign this to me?