Center image in README and update formatting

Added a div tag for centering the image in the README.

Author: saqib777

README.md

@@ -3,7 +3,10 @@
 # Python Projects Collection
 </div>
 
-![wallpaper Python - Notebook](https://github.com/user-attachments/assets/643c2835-0aba-428b-8e5e-ccaf36bcf0b4)
+<div align="center">
+
+  ![wallpaper Python - Notebook](https://github.com/user-attachments/assets/643c2835-0aba-428b-8e5e-ccaf36bcf0b4)
+</div>
 
 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.