Add an icon to the empty view

data/gtk/window.blp

@@ -67,6 +67,7 @@ template RugbyAppWindow : Adw.ApplicationWindow {
         Stack stack {
           StackPage {
             child: Adw.StatusPage empty_page {
+              icon-name: "list";
               title: "No possibilities";
             };
           }

data/icons/scalable/actions/list-symbolic.svg

+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" height="16px" viewBox="0 0 16 16" width="16px"><path d="m 3 1 c -1.089844 0 -2 0.910156 -2 2 v 10 c 0 1.089844 0.910156 2 2 2 h 10 c 1.089844 0 2 -0.910156 2 -2 v -10 c 0 -1.089844 -0.910156 -2 -2 -2 z m 0 2 h 10 v 2 h -10 z m 0 4 h 10 v 2 h -10 z m 0 4 h 10 v 2 h -10 z m 0 0" fill="#222222"/></svg>

data/rugby.gresource.xml

@@ -12,5 +12,6 @@
     <file preprocess="xml-stripblanks" compressed="true">gtk/window.ui</file>
     <file preprocess="xml-stripblanks" compressed="true">icons/scalable/actions/football-american-symbolic.svg</file>
     <file preprocess="xml-stripblanks" compressed="true">icons/scalable/actions/funnel-symbolic.svg</file>
+    <file preprocess="xml-stripblanks" compressed="true">icons/scalable/actions/list-symbolic.svg</file>
   </gresource>
 </gresources>