Add examples for Visual C++ MFC (#208)

mfc-examples/StreamingSpeechRecognition/pch.h

@@ -0,0 +1,15 @@
+// pch.h: This is a precompiled header file.
+// Files listed below are compiled only once, improving build performance for
+// future builds. This also affects IntelliSense performance, including code
+// completion and many code browsing features. However, files listed here are
+// ALL re-compiled if any one of them is updated between builds. Do not add
+// files here that you will be updating frequently as this negates the
+// performance advantage.
+
+#ifndef PCH_H
+#define PCH_H
+
+// add headers that you want to pre-compile here
+#include "framework.h"
+
+#endif  // PCH_H