Initial commit

data/gtktest.gresource.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<gresources>
+  <gresource prefix="/gtktest">
+    <file compressed="true" preprocess="xml-stripblanks">ui/compiled/main.ui</file>
+  </gresource>
+</gresources>

data/ui/main.blp

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+using Gtk 4.0;
+using Adw 1;
+
+Adw.ApplicationWindow mainWindow {
+  title: "Hello world";
+  default-width: 300;
+  default-height: 400;
+
+  Gtk.Box {
+    orientation: vertical;
+
+    Adw.HeaderBar {}
+  }
+}