Update README.md

Author: Mudityadev

README.md

@@ -7,6 +7,8 @@
 
 **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.**
 
+![Demo PainPain Ransomware PoC](web/assets/demo.png)
+
 ---
 
 ## 2. Key Features