added a README explaining how to get the makefile out of sawsim.nw

git-svn-id: svn://abax.physics.drexel.edu/sawsim/trunk@2 865a22a6-13cc-4084-8aa6-876098d8aa20

diff --git a/README b/README
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+Warning: also my noweb-training program.
+
+Extract Makefile and compile with:
+ $ notangle -Rmakefile sawsim.nw | sed 's/        /\t/' > Makefile
+ $ make
+Run the unit tests with
+ $ make check
+