stubs for model finder

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

src/sat/smt/q_model_finder.cpp

@@ -0,0 +1,39 @@
+/*++
+Copyright (c) 2020 Microsoft Corporation
+
+Module Name:
+
+    q_model_finder.cpp
+
+Abstract:
+
+    Model-based quantifier instantiation model-finder plugin
+
+Author:
+
+    Nikolaj Bjorner (nbjorner) 2020-09-29
+
+Notes:
+   
+    Derives from smt/smt_model_finder.cpp
+
+--*/
+
+#include "sat/smt/q_model_finder.h"
+#include "sat/smt/euf_solver.h"
+
+
+namespace q {
+
+    model_finder::model_finder(euf::solver&):
+        ctx(ctx), m(ctx.get_manager()) {}
+
+    expr_ref model_finder::inv_term(model& mdl, quantifier* q, unsigned idx, expr* value, unsigned& generation) {
+        return expr_ref(value, m);
+    }
+
+    void model_finder::restrict_instantiations(::solver& s, model& mdl, quantifier* q, expr_ref_vector const& vars) {
+        
+    }
+
+}