[add] generated swagger sample

Author: i4004

README.md

@@ -57,6 +57,12 @@ public class GetController : Simplify.Web.Controller
 
 5. After application started go to <http://localhost:5000/swagger/index.html> or <http://localhost:5000/swagger/v1/swagger.json> to see generated Swagger
 
+## Example application
+
+Below is the example of Swagger generated by `Simplify.Web.Swagger`:
+
+![Simplify](https://raw.githubusercontent.com/SimplifyNet/Simplify.Web.Swagger/master/images/screenshots/generated-swagger-sample.png.png)
+
 ## Contributing
 
 There are many ways in which you can participate in the project. Like most open-source software projects, contributing code is just one of many outlets where you can help improve. Some of the things that you could help out with are: