Update README with architecture diagram

Author: abd3lraouf

README.md

@@ -22,6 +22,8 @@ Decompose is a powerful Kotlin library for building component-based UIs with cle
 
 This project follows a component-based architecture where each screen is a self-contained component:
 
+![Architecture Diagram](https://raw.githubusercontent.com/abd3lraouf/decompose-tutorial/master/assets/architecture.svg)
+
 ```
 App
  ├── Root Component