Python Solution for Trapping Rain Water Problem in DSA 450

[dsrao711]

Is your feature request related to a problem? Please describe. A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]

Add Python solution for Trapping Rain Water problem in DSA 450

Describe the solution you'd like A clear and concise description of what you want to happen. Link to problem : https://practice.geeksforgeeks.org/problems/trapping-rain-water-1587115621/1

Describe alternatives you've considered A clear and concise description of any alternative solutions or features you've considered.

Additional context Add any other context or screenshots about the feature request here.

[dsrao711]

Please assign me this issue

[smv1999]

Sure @dsrao711 , you can go ahead.