add geant4 scene and gcompose app

src/HEP/Geant/testing/GeantApp.cpp

@@ -0,0 +1,18 @@
+
+
+#include "Math/ContainerBox.h"
+#include "Math/Dense.h"
+#include "HEP/Geant/Scene.h"
+
+using namespace uLib;
+
+int main() {
+
+  uLib::ContainerBox world_box(Vector3f(100, 100, 100));
+  uLib::Scene scene;
+
+  scene.ConstructWorldBox(&world_box, "G4_AIR");
+  scene.Initialize();
+
+  return 0;
+}