[static-web] appdata: Add gtk4-demo

[Matthias Clasen <matthiasc src gnome org>]

commit f48110f06b0454f02cd6c002228296bd46f83cd5
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Mar 20 19:28:03 2018 -0400

    appdata: Add gtk4-demo

 appdata/gtk4-demo/gtk-demo1.png |  Bin 0 -> 104996 bytes
 appdata/gtk4-demo/gtk-demo2.png |  Bin 0 -> 204905 bytes
 2 files changed, 0 insertions(+), 0 deletions(-)
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diff --git a/appdata/gtk4-demo/gtk-demo1.png b/appdata/gtk4-demo/gtk-demo1.png
new file mode 100644
index 0000000..4609531
Binary files /dev/null and b/appdata/gtk4-demo/gtk-demo1.png differ
diff --git a/appdata/gtk4-demo/gtk-demo2.png b/appdata/gtk4-demo/gtk-demo2.png
new file mode 100644
index 0000000..56604d1
Binary files /dev/null and b/appdata/gtk4-demo/gtk-demo2.png differ