Add image to README for visual appeal

Added an image to enhance the README file.

Author: saqib777

README.md

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 # Python Projects Collection
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+![wallpaper Python - Notebook](https://github.com/user-attachments/assets/643c2835-0aba-428b-8e5e-ccaf36bcf0b4)
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 This repository contains a set of small, beginner-friendly Python projects designed to help you practice programming fundamentals like loops, conditionals, file handling, functions, and modules.  
 Each project is complete, well-commented, and easy to understand.