Add wgc demo

application/remote_desk/demo/App.h

@@ -0,0 +1,24 @@
+#pragma once
+
+class SimpleCapture;
+
+class App {
+public:
+  App() {}
+  ~App() {}
+
+  void Initialize(winrt::Windows::UI::Composition::ContainerVisual const &root);
+
+  void StartCapture(HWND hwnd);
+  void StartCapture(HMONITOR hmonitor);
+
+private:
+  winrt::Windows::UI::Composition::Compositor m_compositor{nullptr};
+  winrt::Windows::UI::Composition::ContainerVisual m_root{nullptr};
+  winrt::Windows::UI::Composition::SpriteVisual m_content{nullptr};
+  winrt::Windows::UI::Composition::CompositionSurfaceBrush m_brush{nullptr};
+
+  winrt::Windows::Graphics::DirectX::Direct3D11::IDirect3DDevice m_device{
+      nullptr};
+  std::unique_ptr<SimpleCapture> m_capture{nullptr};
+};