docs: add Spot the Difference project description and create web-app documentation

Author: KhushiVadadoriya

README.md

@@ -247,6 +247,16 @@ Test your memory with an ever-growing sequence!
 python games/Simon-Says/Simon-Says.py
 ```
 
+</td>
+<td width="50%">
+
+#### 🔍 Spot the Difference
+Find all the hidden differences between two interactive canvases!
+- 🎨 Programmatically drawn dynamic scenes
+- 🌟 Three distinct difficulty levels
+- ⏱️ Built-in timer and hint system
+- 🌐 *Web App Exclusive Project*
+
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web-app/README.md

@@ -20,6 +20,7 @@ An interactive web application showcasing Python mini projects with beautiful vi
 - **Hangman** - Classic word game 
 - **FLAMES** - Relationship calculator 
 - **Simon Says** - Memory Game
+- **Spot the Difference** - Visual puzzle game with dynamic scenes
 
 ### 🔢 Math Tools
 - **Fibonacci Series** - Visual sequence with golden spiral