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_variators.h

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+/* See COPYING.txt for the full license governing this code. */
+/**
+ * \file SDL_visualtest_variators.h
+ *
+ * Header for all the variators that vary input parameters to a SUT application.
+ */
+
+#include "SDL_visualtest_exhaustive_variator.h"
+#include "SDL_visualtest_random_variator.h"
+
+#ifndef _SDL_visualtest_variators_h
+#define _SDL_visualtest_variators_h
+
+/* Set up for C function definitions, even when using C++ */
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Struct that acts like a wrapper around the different types of variators
+ * available.
+ */
+typedef struct SDLVisualTest_Variator
+{
+    /*! Type of the variator */
+    SDLVisualTest_VariatorType type;
+    /*! union object that stores the variator */
+    union
+    {
+        SDLVisualTest_ExhaustiveVariator exhaustive;
+        SDLVisualTest_RandomVariator random;
+    } data;
+} SDLVisualTest_Variator;
+
+/**
+ * Initializes the variator object pointed to by \c variator of type \c type
+ * with information from the config object pointed to by \c config.
+ *
+ * \return 1 on success, 0 on failure
+ */
+int SDLVisualTest_InitVariator(SDLVisualTest_Variator* variator,
+                               SDLVisualTest_SUTConfig* config,
+                               SDLVisualTest_VariatorType type,
+                               Uint64 seed);
+
+/**
+ * Gets the next variation using the variator.
+ *
+ * \return The arguments string representing the variation on success, and
+ *         NULL on failure. The pointer returned should not be freed.
+ */
+char* SDLVisualTest_GetNextVariation(SDLVisualTest_Variator* variator);
+
+/**
+ * Frees any resources associated with the variator.
+ */
+void SDLVisualTest_FreeVariator(SDLVisualTest_Variator* variator);
+
+/* Ends C function definitions when using C++ */
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _SDL_visualtest_variators_h */