create new file for feasibility pump

Author: ZedongPeng

internal/feasibility_pump.h

@@ -0,0 +1,14 @@
+#pragma once
+
+#include "internal_types.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+    void feasibility_polish(const pdhg_parameters_t *params, pdhg_solver_state_t *state);
+
+#ifdef __cplusplus
+}
+#endif