documented shortcode

Author: emsimons

layouts/shortcodes/centered-figure.html

@@ -1,3 +1,13 @@
+<!-- Required parameters:
+src: path to image file
+Optional parameters: 
+alt: alternative text for the image
+width: width of the image container (default is 100%)
+border-weight: weight of the border around the image (default is 0px, i.e., no border)
+caption: caption text for the image (optional, supports markdown formatting)
+-->
+
+
 <div style="display: block; margin: 0 auto; max-width: {{ .Get "width" | default "100%" }};">
     <img 
       src="{{ .Get "src" }}"