Added gui prototype

doc/gui_test/main.cpp

@@ -0,0 +1,40 @@
+
+
+#include "mainwindow.h"
+
+#include <QApplication>
+
+#include <QApplication>
+#include <QMetaEnum>
+#include <QFile>
+#include <QLabel>
+#include <QProgressBar>
+
+// main.cpp
+#include <QCoreApplication>
+#include <QTimer>
+#include <QDebug>
+
+bool setApplicationStyleSheet( QAnyStringView path )
+{
+  QFile styleFile( path.toString() );
+  if (styleFile.open(QIODevice::ReadOnly | QIODevice::Text))
+    {
+      QString style = styleFile.readAll();
+      qApp->setStyleSheet(style);
+      styleFile.close();
+      return true;
+    }
+
+  qWarning() << "Konnte Stylesheet nicht laden:" << styleFile.errorString();
+  return true;
+}
+
+int main (int argc, char *argv[])
+{
+  QApplication a (argc, argv);
+  setApplicationStyleSheet( u":gui_test.qss" );
+  MainWindow w;
+  w.show ();
+  return a.exec ();
+}