Add Codechef Problems

[gopalgoel19]

If you have solutions to problems not already in the repo, add your solution.
Must follow the guidelines mentioned in the README file.

[anshumanv]

CodeChef problem's solutions are actively maintained here : https://github.com/iiitv/ChefLib

[gopalgoel19]

This repo is for any problem whatsoever. Not specifically contest problem.

[anshumanv]

Alright 👍

[adikul30]

Have a look at #24 Removed the ongoing contest problem. Sorry for that. Wasn't aware of the rule.

[Mask123pru]

@gopalgoel review PR #25

[namish800]

@gopalgoel review PR #27

[aptrishu]

Can you please assign me this issue?
Thanks.