Create README.md

Author: jmp75

README.md

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+R.NET
+=======
+
+R.NET enables the .NET Framework to interoperate with the R statistical language in the same process. R.NET works on Windows, Linux and MacOS. 
+
+# Software requirements
+
+On Windows, R.NET requires .NET Framework 4 or later and an access to the native R libraries installed with the R environment. R needs not necessarily be installed as a software on the exec uting machine, so long as DLL files are accessible.
+On Linux and MacOS, Mono is required, as well as an access to the native R libraries.
+
+You can also have a look at the legacy page [Software Prerequisites](http://rdotnet.codeplex.com/wikipage?title=Software%20Prerequisites)
+
+# Using R.NET
+
+You will find material to get started at the [legacy documentation on Codeplex](http://rdotnet.codeplex.com/documentation)