Pramod Gupta

- fixes #99 - Replaces string concatenation with use of StringBuilder. - Optimized if condition

Added BSTIterator implementation

2

- Added an Implementation for BST Iterator using Queue. - Fixes #100

- We have BFS and DFS images in both Breadth First Traversal and Depth First Traversal. We should have illustrations in the respective sections.

Add implementation of BST Iterator using queue

2

Add implementation of BST Iterator using queue

Add read me files for every system design solution

5

@npathai I would recommend adding read me files to each use case. It would help readers understand code and flow of solution,