Add some documenation

test/README.org

+This directory contains Lustre versions of the ASM algorithms available
+in Ocaml in file:../../test/
+
+More precisely, each directory contains :
+- a lustre implementation of an ASM algorithm
+- some symbolic links to their Ocaml implementation
+- a lustre oracle that checks (with lurette) that both implementations behaves the same
+- a =verify.lus= that models some properties to be model-checked (with lesar or kinds2)
+- a Makefile to run simulations or model-checking
+
+To simulate or to model-check such Lustre programs, one can use
+- =gg= and =gg-deco= to generate topologies via =.dot= files
+- =salut= to generate a lustre versions of the =.dot= files
+- the various =Makefiles= for examples of uses
+