update readme

Author: bndynet

README.md

@@ -4,6 +4,8 @@ A web framework with Admin template for building great Web sites and Web applica
 
 The *Admin Template* based on AdminLTE. Use `with-sidebar-horizontal` to set the sidebar horizontal.
 
+![](https://raw.githubusercontent.com/BndyNet/web-framework/master/screenshots/home-sidebar-horizontal.png)
+
 ### Languages:
  - HTML, SCSS, CoffeeScript
  - C#