Added a README file regarding WinRT support

To note, this file is currently formatted with CRLF line endings, rather than
LF, to allow the file to be viewed with Notepad.

visualtest/include/SDL_visualtest_mischelper.h

@@ -0,0 +1,26 @@
+/**
+ * \file mischelper.c 
+ *
+ * Header with miscellaneous helper functions.
+ */
+
+#ifndef _SDL_visualtest_mischelper_h
+#define _SDL_visualtest_mischelper_h
+
+/* Set up for C function definitions, even when using C++ */
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Stores a 32 digit hexadecimal string representing the MD5 hash of the
+ * string \c str in \c hash.
+ */
+void SDLVisualTest_HashString(char* str, char hash[33]);
+
+/* Ends C function definitions when using C++ */
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _SDL_visualtest_mischelper_h */