float16: add missing config file.

Author: cayrols

config/return_float16.cc

@@ -0,0 +1,19 @@
+// Copyright (c) 2017-2022, University of Tennessee. All rights reserved.
+// SPDX-License-Identifier: BSD-3-Clause
+// This program is free software: you can redistribute it and/or modify it under
+// the terms of the BSD 3-Clause license. See the accompanying LICENSE file.
+
+#include <stdio.h>
+
+#include "config.h"
+
+//------------------------------------------------------------------------------
+int main()
+{
+    _Float16 a = 0.1;
+    _Float16 b = 0.2;
+    _Float16 c = a + b;
+
+    printf( "%f + %f = %f -- expected 0.3\n", (float)a, (float)b, (float)c );
+    return 0;
+}