add placeholder for simplification

src/math/polysat/simplify.h

@@ -0,0 +1,31 @@
+/*++
+Copyright (c) 2021 Microsoft Corporation
+
+Module Name:
+
+    Simplification
+
+Author:
+
+    Jakob Rath, Nikolaj Bjorner (nbjorner) 2021-12-12
+
+--*/
+#pragma once
+#include "math/polysat/constraint.h"
+
+namespace polysat {
+
+    class solver;
+
+    class simplify {
+        solver& s;
+
+    public:
+        simplify(solver& s);
+
+        bool should_apply() const;
+
+        void operator()();
+    };
+
+}