initial documententation of helper function

Author: zamronypj

utilities/helper-functions/index.md

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+---
+title: Helper functions
+description: Tutorial on how to use helper functions provided by Fano Framework
+---
+
+<h1 class="major">Helper functions</h1>
+
+## About Helper function
+
+![Rate limiting](/assets/images/rate-limit.jpg){:class="image fit"}
+
+(Image by Ludovic Charlet [unsplash.com](https://unsplash.com/photos/CGWK6k2RduY)).
+
+