Added Suduko Solver

[shyam640]

• [x] My Pull Request adheres to the Contribution guidelines.
• [x] I have added problem.md and solution files in the appropriate folder.
• [x] In problem.md I have provided a correct link to the problem.
  (In case you are not adding a problem, you can freely mark this as complete)
• [x] The solution I have given is my own and not plagiarized in any form.
• [x] My solution passes all the testcases within the given constraints.
• [x] I have properly indented and documented my solution using comments.
• [x] I agree that all the above marked are true to the best of my knowledge and my PR can be closed if found otherwise.

If any of the above is unmarked, please make the necessary changes and then mark them so that you're PR can be approved and merged.
(Only completed checklist PRs will be reviewed)

[boring-cyborg[bot]]

Hi there :wave: Congratulations on sending your first PR here :sparkles: Your PR will be reviewed soon, in the meantime it would be great if you could star :star: this repo :smiley:

[Vishruth-S]

Please add link to the problem and also add comments in your solution explaining the approach used. This is clearly mentioned in the contribution guidelines. You may submit another PR with the necessary changes, closing this.