added minisat code base

minisat/README

@@ -0,0 +1,24 @@
+================================================================================
+DIRECTORY OVERVIEW:
+
+mtl/            Mini Template Library
+utils/          Generic helper code (I/O, Parsing, CPU-time, etc)
+core/           A core version of the solver
+simp/           An extended solver with simplification capabilities
+README
+LICENSE
+
+================================================================================
+BUILDING: (release version: without assertions, statically linked, etc)
+
+export MROOT=<minisat-dir>              (or setenv in cshell)
+cd { core | simp }
+gmake rs
+cp minisat_static <install-dir>/minisat
+
+================================================================================
+EXAMPLES:
+
+Run minisat with same heuristics as version 2.0:
+
+> minisat <cnf-file> -no-luby -rinc=1.5 -phase-saving=0 -rnd-freq=0.02