Update README.md

Author: viartemev

README.md

@@ -62,3 +62,7 @@ You can support the project by the following actions:
 * Tell your ideas
 
 <a href="https://www.buymeacoffee.com/vartemyev" target="_blank"><img src="https://www.buymeacoffee.com/assets/img/custom_images/orange_img.png" alt="Buy Me A Coffee" style="height: 41px !important;width: 174px !important;box-shadow: 0px 3px 2px 0px rgba(190, 190, 190, 0.5) !important;-webkit-box-shadow: 0px 3px 2px 0px rgba(190, 190, 190, 0.5) !important;" ></a>
+
+## Demo
+
+![](art/requestmapper.gif)