add  contact info .
diff --git a/README.md b/README.md
index bf1c34d..e9d6c5e 100644
--- a/README.md
+++ b/README.md
@@ -15,6 +15,7 @@
 
 ## Architecture
 
+<img src="docs/arch.png" width="680" />
 
 ## Getting Started