Permutations_of_String file added

[Madhuparna04]

Resolves #127

Description

This is a python code that generates all permutations of a string taken as input.

Technical Specifications

Python3 Program

Screenshots (if required)

How to run

Run the following command on terminal python3 madhuparna.py

Checklist

• [x] Code compiles correctly.
• [x] Changes are tested properly.
• [x] Added the README / documentation, if necessary.
• [x] Followed the Contributing guidelines.
• [x] Resolved merge conflicts, if any.

[pvgupta24]

@Madhuparna04 please edit the PR title and description.