Add basic README

A simple README with a short summary of the project and a link
directing people to the online documentation.

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+The Solaris Porting Layer (SPL) is a Linux kernel module which provides
+many of the Solaris kernel APIs.  This shim layer makes it possible to
+run Solaris kernel code in the Linux kernel with relatively minimal
+modification.  This can be particularly useful when you want to track
+upstream Solaris development closely and don’t want the overhead of
+maintaining a large patch which converts Solaris primitives to Linux
+primitives.
+
+Documentation for building, configuring, and using the SPL can be
+found at: <http://wiki.github.com/behlendorf/spl/>