Put comments in every sorting code

[sambhav2612]

Please help in improving the readability of the codes by putting comments at there appropriate places.

Please comment here so I can assign it to you on first come basis. Add yourself into CONTRIBUTORS.md under the following format:

- <Your name>[<(@Your GitHub username)>](<Your profile link>)

For example: 

- Sambhav Jain [(@sambhav2612)](https://github.com/sambhav2612)

Thanks for stopping by.

[zazulam]

Is there a particular sorting algorithm you want commented first?

[sambhav2612]

nope, just want all of them to be readable

[zazulam]

Okay cool, I'll do my best

[piyu007]

hey @sambhav2612 added comments to each and every sorting file

[aditya81070]

@Pujolsluis I have already commented that code.

[sambhav2612]

@aditya81070 has been assigned to this

[Pujolsluis]

@aditya81070 Sorry i didn't notice, since you're pull request was not up when i started working on it, i made my PR of the comments and a few improvements i did to the code i think it would be a nice collab you guys can check it out if you want. Sorry for the misunderstanding. #12

[samhitav]

I am interested.