add detailed sfml example

add simple wxWidgets example

CPlusPlus/wxWidgets/MyApp.h

@@ -0,0 +1,10 @@
+#pragma once
+#include <wx/wx.h>
+
+class MyApp : public wxApp
+{
+public:
+	bool OnInit() override;
+};
+
+wxIMPLEMENT_APP(MyApp);