Add official documentation links

Author: lane-formio

Readme.md

@@ -1,6 +1,13 @@
 # Form.io Bootstrap Templates
 
-This repository will change the rendering of forms in formio.js so that it uses html and classes compatible with [Bootstrap 3](https://getbootstrap.com/docs/3.4/) and [Bootstrap 4](https://getbootstrap.com/docs/4.6/getting-started/introduction/) framework. 
+# Form.io Bootstrap Templates
+This repository will change the rendering of forms in formio.js so that it uses html and classes compatible with [Bootstrap 3](https://getbootstrap.com/docs/3.4/), [Bootstrap 4](https://getbootstrap.com/docs/4.6/getting-started/introduction/), and [Bootstrap 5](https://getbootstrap.com/docs/5.3/getting-started/introduction/) frameworks.
+
+Official Documentation
+--------------------------
+For the latest documentation, release information, and guides, always refer to the official Form.io Help Documentation available here:
+
+**[https://help.form.io](https://help.form.io/dev/css-frameworks)**
 
 ### Using Bootstrap 3