add python implementaion of trie

[epsilon06]

This PR implements the code for trie implementation in python I have read the contributing guidelines in CONTRIBUTING.md and have ensured the following:

• [. ] My code is placed in the required directory as outlined in CONTRIBUTING.md
• [ .] My code file is named according to CONTRIBUTING.md
• [ .] Variables, classes, functions etc. follow camel case as outlined in CONTRIBUTING.md
• [ .] My code hasn't been implemented or claimed by someone else and I have checked the present issues and PRs for the same
• [ .] My code is well commented
• [ .] If my code is the first implementation of trie, I have added the link to this directory in README.md
• [ .] I have not copied my code from anywhere

This PR creates/modifies the README for

I have read the contributing guidelines in CONTRIBUTING.md and have ensured the following:

• [ .] Algo name (as heading)
• [ .] A small description about algo
• [ .] Time Complexity (Worst, Average, Best case)
• [ .] Space Complexity (Worst, Average, Best case)
• [ .] Logic and Pseudocode
• [ .] Instructions for running code