Added 15 Puzzle Game

[ADV1K]

Description

Opened another pull request because the last one had many problems.
Added 15Puzzle game.

Fixes #(512)

Replace issue_no in the above line, with the issue related to this PR.

Type of change

Choosing one or more options from the following as per the nature of your Pull request.

• NOTE: These boxes can be checked using [X]

• Bug fix (non-breaking change which fixes an issue)

• New feature (non-breaking change which adds functionality)

• Documentation Update

Checklist:

Please tick all the boxes that are fulfilled by your Pull Request.

• I have named my files and folder, according to this project's guidelines.
• My code follows the style guidelines of this project.
• My Pull Request has a descriptive title. (not a vague title like Update index.md)
• I have commented on my code, particularly in hard-to-understand areas.
• I have created a helpful and easy to understand README.md, according to the given README_TEMPLATE.
• I have included a requirements.txt file (if external libraries are required.)
• My changes do not produce any warnings.
• I have added a working sample/screenshot of the script.

[AdityaJ7]

@all-contributors please add @ADV1K for code

[allcontributors]

@AdityaJ7

I've put up a pull request to add @ADV1K! 🎉

[tusharnankani]

@ADV1K The script is working well! I didn't win, though. XD

So, here's a suggestion from my end:

• Can you build a script that solves this in minimum number of moves using backtracking?
• Can you add a few more buttons - RESET, UNDO and Solve
  • RESET will print a new random grid and the moves/score will be set to zero.
  • UNDO will undo the previous moves.
  • Solve will show moves, possibly every second to the final grid.

Let me know if this is possible?

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