Doc: mention the Evil module in the contributors guide

guides/contributors/README.org

@@ -72,6 +72,14 @@ by:
 - [[file:../../lib/sasacore/genLutin.mli][../../lib/sasacore/genLutin.mli]]
 - [[file:../../lib/sasacore/genLutin.ml ][../../lib/sasacore/genLutin.ml]]
 
+Daemons  that take  advantage of  the potential  function to  generate
+worst case scenarii are defined in the Evil module.
+
+#+INCLUDE: "../../lib/sasacore/evil.mli" src ocaml
+- [[file:../../lib/sasacore/demon.mli][../../lib/sasacore/evil.mli]]
+- [[file:../../lib/sasacore/demon.ml][../../lib/sasacore/evil.ml]]
+
+
 * Processes
 
 #+INCLUDE: "../../lib/sasacore/process.mli" src ocaml
@@ -85,7 +93,7 @@ by:
 
 * The Main Simulation 
 
-It is splitted into 2 modules, so that the sasa rdbg plugin can reuse
+It is splited into 2 modules, so that the sasa rdbg plugin can reuse
 the step functions:
 1. [[file:../../lib/sasacore/sasa.ml][../../lib/sasacore/sasa.ml]]
 2. [[file:../../src/sasaMain.ml][../../src/sasaMain.ml]]