Shortcode support
When your shortcode (youtube.html for example) starts with a comment in which you show how it can be used, the CMS reads that comment. An example is shown below.
<!--
{{/*
Usage:
{{< youtube id="qtIqKaDlqXo" image="/uploads/youtubeposter.jpg" >}}
*/}}
-->
If you add something similar to the code above, the CMS will add a button called ‘youtube’ that will insert this example shortcode.
