Add qdraw extension to revealjs.yml (#1747)

Allows drawing and erasing in a revealjs presentation rendered via quarto.

(cherry picked from commit 4adafd8)

Author: mahmudstat

docs/extensions/listings/revealjs.yml

@@ -95,6 +95,12 @@
   description: >
     Switch the cursor to a 'pointer' style element.
 
+- name: qdraw
+  path: https://github.com/mahmudstat/qdraw
+  author: '[Abdullah Al Mahmud](https://github.com/mahmudstat)'
+  description: >
+    Adds drawing and erasing functionality to slides.
+
 - name: quiz
   path: https://github.com/parmsam/quarto-quiz
   author: '[Sam Parmar](https://github.com/parmsam)'