[gtk] iconbrowser: Add screenshots to appdata

[Matthias Clasen <matthiasc src gnome org>]

commit 9722bb4d9e6508ebbaf4d237e5580a7209db31f4
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Jul 29 20:23:46 2020 -0400

    iconbrowser: Add screenshots to appdata
    
    appstream validation is picky and insists we have
    at least on screenshot.

 demos/icon-browser/org.gtk.IconBrowser4.appdata.xml | 8 ++++++++
 1 file changed, 8 insertions(+)
---
diff --git a/demos/icon-browser/org.gtk.IconBrowser4.appdata.xml 
b/demos/icon-browser/org.gtk.IconBrowser4.appdata.xml
index 33a3a88d49..8ae3f259f6 100644
--- a/demos/icon-browser/org.gtk.IconBrowser4.appdata.xml
+++ b/demos/icon-browser/org.gtk.IconBrowser4.appdata.xml
@@ -12,6 +12,14 @@
     </p>
   </description>
   <screenshots>
+    <screenshot>
+      <image>https://static.gnome.org/appdata/gtk4-icon-browser/gtk-icon-browser1.png</image>
+      <caption>Icon Browser</caption>
+    </screenshot>
+    <screenshot>
+      <image>https://static.gnome.org/appdata/gtk4-icon-browser/gtk-icon-browser2.png</image>
+      <caption>Search</caption>
+    </screenshot>
   </screenshots>
   <kudos>
     <kudo>HiDpiIcon</kudo>