Added the python code for vertical traversal of tree

[prakharshukla48]

Have you read the Contribution Guidelines?

Yes, I have

Description

I have added the python code to the problem vertical traversal of binary tree as assigned to me.

Checklist

• [x] I've read the contribution guidelines.
• [x] I've checked the issue list before deciding what to submit.
• [x] I've edited the README.md and link to my code.

Related Issues (Mention Issue no. like #xxx)

issue#108 Fixes Issue
(Write your answer above.)

[manan025]

108