Add cost.mli

Reviewed By: ezgicicek

Differential Revision: D8876442

fbshipit-source-id: d2116dc3b

infer/src/checkers/cost.mli

@@ -0,0 +1,10 @@
+(*
+ * Copyright (c) 2017-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *)
+
+open! IStd
+
+val checker : Callbacks.proc_callback_t