Update README.md to include demo image and enhance project overview

Author: Mudityadev

README.md

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-# PainPain Ransomware PoC Documentation
+# PainPain Ransomware PoC
 
 ## 1. Overview
 
+![Demo PainPain Ransomware PoC](web/assets/demo.png)
+
+
 **PainPain** is a modular, educational Proof-of-Concept (PoC) ransomware project. It demonstrates file discovery, encryption, exfiltration, and a realistic GUI, all for research and ethical hacking education. **Do not use for malicious purposes.**
 
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