[static-web] appdata: Add a gtk4-node-editor screenshot

[Matthias Clasen <matthiasc src gnome org>]

commit 5700e8bbe3f0b63c941ebea728c20cc585ffc47a
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri May 6 23:45:34 2022 -0400

    appdata: Add a gtk4-node-editor screenshot

 appdata/gtk4-node-editor/gtk4-node-editor.png | Bin 0 -> 79015 bytes
 1 file changed, 0 insertions(+), 0 deletions(-)
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diff --git a/appdata/gtk4-node-editor/gtk4-node-editor.png b/appdata/gtk4-node-editor/gtk4-node-editor.png
new file mode 100644
index 0000000..3a4ab19
Binary files /dev/null and b/appdata/gtk4-node-editor/gtk4-node-editor.png differ