Added Sudoku game with GUI

[Yarlin16]

Describe your changes (Mandatory)

I have added a new game : Sudoku with GUI under KWoC 2023 Also I have updated the README files for both Sudoku and previously added Caesar Cipher 2.0 project.

Issue ticket number and link (Mandatory)

77

Screenshots of your project output, whatever you have added. (Mandatory)

Checklist before requesting a review

• [x] I have performed a self-review of my code
• [x] If it is a new project, I have done thorough tests.
• [x] Have you updated the README file of the repository and added the name of the project in it?
• [x] Have you added a README.md file inside the directory of your project and explained it there properly (with images)?

[shrey141102]

👍🏻