Added Merge Sort in the Sorting directory

[Nishant-Sagar]

PR Title

Added Merge Sort in the Sorting directory and added README file for TCP Chat Server.

Summary

I have added a new sorting algo in Sorting directory and added README file for TCP Chat Server

Description

Earlier there were only 3 sorting algos so I thought of adding a new one, also I have added README file for TCP Chat Server

Checks

in the repository

• [x] Made no changes that degrades the functioning of the repository
• [x] Gave each commit a better title (unlike updated README.md)

in the PR

• [x] Followed the format of the pull_request_template
• [x] Made the Pull Request in a small level (for the creator's wellfare)
• [x] Tested the changes you made

Thank You, Nishant Sagar