add win32 ver

windows/README.md

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+The solution has been created with Visual Studio Express 2010.
+Make sure to compile the Release version
+
+Build
+====
+* Build the project ```rabit``` , this will give you ```rabit.lib``` in ```x64\Release```
+
+Build Your code with rabit
+====
+* Add include to the dependency path of your project
+* Add ```rabit.lib``` to the linker dependency  
+* The project basic is an example to show you how to build rabit with basic.cc