added banner to README

Author: Felix-xilef

README.md

@@ -5,3 +5,5 @@ An UI Toolkit component for simple usage of icon fonts at the UI.
 > For more information about the package and it's usage check the [Package README](Assets/UI%20Toolkit%20Icon%20Component/README.md)
 
 ### **Don't forget to also check out the package at [Unity Asset Store](https://assetstore.unity.com/packages/slug/293215)**
+
+![Banner](banner.png)