docs: use GitHub markdown note

Author: kenjis

README.md

@@ -48,9 +48,10 @@ CodeIgniter is developed completely on a volunteer basis. As such, please give u
 for your issues to be reviewed. If you haven't heard from one of the team in that time period,
 feel free to leave a comment on the issue so that it gets brought back to our attention.
 
-We use GitHub issues to track **BUGS** and to track approved **DEVELOPMENT** work packages.
-We use our [forum](http://forum.codeigniter.com) to provide SUPPORT and to discuss
-FEATURE REQUESTS.
+> [!IMPORTANT]
+> We use GitHub issues to track **BUGS** and to track approved **DEVELOPMENT** work packages.
+> We use our [forum](http://forum.codeigniter.com) to provide SUPPORT and to discuss
+> FEATURE REQUESTS.
 
 If you raise an issue here that pertains to support or a feature request, it will
 be closed! If you are not sure if you have found a bug, raise a thread on the forum first -