README.md: add notes to How to compile on Windows

Jud White

2018-03-25 c6ecf1e0420737eafeb99b27b1d716b46a6cbb7a

 build/darknet/yolo_console_dll.vcxproj

@@ -118,6 +118,7 @@
      <AdditionalIncludeDirectories>C:\opencv_source\opencv\bin\install\include</AdditionalIncludeDirectories>
      <PreprocessorDefinitions>_CRT_SECURE_NO_WARNINGS;_MBCS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
      <ExceptionHandling>Async</ExceptionHandling>
      <OpenMPSupport>true</OpenMPSupport>
    </ClCompile>
    <Link>
      <EnableCOMDATFolding>true</EnableCOMDATFolding>