added module descriptions

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>

src/ast/simplifier/arith_simplifier_params.cpp

@@ -0,0 +1,26 @@
+/*++
+Copyright (c) 2006 Microsoft Corporation
+
+Module Name:
+
+    arith_simplifier_params.cpp
+
+Abstract:
+
+    <abstract>
+
+Author:
+
+    Leonardo de Moura (leonardo) 2012-12-02.
+
+Revision History:
+
+--*/
+#include"arith_simplifier_params.h"
+#include"arith_simplifier_params_helper.hpp"
+
+void arith_simplifier_params::updt_params(params_ref const & _p) {
+    arith_simplifier_params_helper p(_p);
+    m_arith_expand_eqs      = p.arith_expand_eqs();
+    m_arith_process_all_eqs = p.arith_process_all_eqs();
+}