add Qt viewport

app/gcompose/src/MainWindow.cpp

@@ -0,0 +1,15 @@
+#include "MainWindow.h"
+#include <Vtk/vtkQViewport.h>
+
+using namespace uLib;
+
+MainWindow::MainWindow(QWidget* parent) : QMainWindow(parent) {
+    m_viewport = new Vtk::QViewport(this);
+    setCentralWidget(m_viewport);
+
+    setWindowTitle("gcompose - Qt VTK Interface");
+    resize(1200, 800);
+}
+
+MainWindow::~MainWindow() {
+}