Adds initial intermediate qt6 porting state

qt6-after/qt6-migrated-legatus/Lts/Projects/DemoTablet/main.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <PluginInterfaces/project_plugin_interface.h>
+
+#include <QObject>
+
+
+class Project : public QObject, public ProjectPlugin::Plugin
+{
+  Q_PLUGIN_METADATA(IID "project:3:demotablet")
+  Q_INTERFACES(ProjectPlugin::Plugin)
+
+  Q_OBJECT
+
+public:
+  Project() = default;
+  ~Project() = default;
+};
+
+