Add Ternary Search code in Python 3

[Git-Harshit]

This Pull Request adds a tried and tested Python 3 program for implementing Ternary Search in a one dimensional array, in Python 3 (under Python/ directory).

The code is also well-commented for others to be able to understand it. Please look into the code, let me know if any updations are needed, and merge it into your collection. 🙂

Also, as this is my first commit in your repository, I have been asked by your Greet Bot (@github-actions) to add my name in Contributors.md. I'm including my github username in Contributors.md as well.

[github-actions[bot]]

Greet Contributors Bot
Thank you for taking your time and effort for your contribution. If you are a new contributor to this repo, kindly add your username in CONTRIBUTORS.md

The amazing contributor in this pull request is @Git-Harshit