add relevant video link

Author: zamronypj

utilities/rate-limit/index.md

@@ -240,6 +240,13 @@ container.add(
 );
 ```
 
+## Rate-limiting video tutorial
+
+
+[![Rate limiting video tutorial](/assets/images/func-as-controller.png){:class="image fit"}](https://youtu.be/dfmArIN4s-o "Rate limiting video tutorial")
+
+Rate-limiting video tutorial explains how to use rate limit middleware to restrict number of request client can make.
+
 ## Explore more
 
 - [Utilities](/utilities)