add logo

README.md

 # ChatMan
 
-## About ChatMan
+<p align="center"> <img src="photoshop_assets/logo.png" alt="logo" width="600"/> </p>
+
+## About
 
 ChatMan is a multi purpose chatbot built for ITB-IF3111 class assignment.  
 
 ## Display
-<img src="photoshop_assets/login_page.jpg" alt="login_page" width="250"/>  <img src="photoshop_assets/bot_chatroom.jpg" alt="bot_chatroom" width="250"/>    
+<p align="center"> <img src="photoshop_assets/login_page.jpg" alt="login_page" width="250"/>  <img src="photoshop_assets/bot_chatroom.jpg" alt="bot_chatroom" width="250"/> </p>