Check in a README file

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+To run SATCheck, you need to have built a SAT Solver from SATlib.  To
+obtain SATlib (from within the SATCheck directory):
+
+git clone git://plrg.eecs.uci.edu/satlib.git
+
+Then build a SAT solver in the SATlib distribution.  For example:
+
+cd satlib/glucose-syrup/incremental
+make
+cp glucose ../../../sat_solver
+
+Then you can build SATCheck.  Simply type make from within the main
+SATCheck directory.
+
+One might find the options in config.h useful.