docs(readme): add screenshots

README.md

@@ -1,6 +1,10 @@
 # deltachat-ios
 
-Email-based instant messaging for iOS.
+>  Email-based instant messaging for iOS.
+
+
+
+![Screenshot Chat List](supporting_images/screenshot_chat_list.png) ![Screenshot Chat View](supporting_images/screenshot_chat_view.png)
 
 ## Testing