Add Pygame Quick Start Guide to README under Game Development section

[gabopython]

Description

Add Pygame Quick Start Guide to README under Game Development section

Motivation and Context

This change is required because it is good having a game development section for Python

How Has This Been Tested?

I tested the link, it works fine

Types of changes

• Content Update (change which fixes an issue or updates an already existing submission)
• [ x] New Article (change which adds functionality)
• [ x] Documentation change

Checklist:

• [x ] My code follows the code style of this project.
• [ x] I have updated the documentation accordingly.
• [ x] I have read the CONTRIBUTING document.
• [x ] I have made checks to ensure URLs and other resources are valid