Add step-by-step instructions for use with Visual Studio

[MarkWithall]

...and any required modifications to the library.

[MarkWithall]

Can't initialize struct in the same way, so need to do:

#define TEST(test_name) \
    struct TESTickle_test_result test_name() \
    { \
        struct TESTickle_test_result TESTickle_result = {false, false};

In test runner, may need to include:

#include "stdafx.h"

[MarkWithall]

Function snprintf is only available in Visual Studio 2015.

Options: http://stackoverflow.com/questions/2915672/snprintf-and-visual-studio-2010