chore: add QMarkdown promo

hawkeye64 · hawkeye64 · commit 9686ce6f8663 · 2019-05-29T13:10:28.000-06:00
diff --git a/demo/src/markdown/iconpicker.md b/demo/src/markdown/iconpicker.md
@@ -74,3 +74,5 @@ All colors can be from the [Quasar Color Pallete](https://quasar.dev/style/color
 | --- | --- | --- |
 | icon | String (icon name) | Change the way the icon data is displayed |
 
+---
+This page created with [QMarkdown](https://quasarframework.github.io/app-extension-qmarkdown), another great Quasar App Extension.
