added snake game using python

[amanjuneja420]

Added the code of python tkinter for snake game.

Description

This is the classic snake game in which snake has to collect orb which increase it's length and score of the game .
The player can control the snake's movement using arrow keys.
If the snake touches it's own body then it's game over.

Motivation and Context

How Has This Been Tested?

Tested the game for different situations

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.