Add h5cpp from tomviz

We may refactor this into a shared submodule in the future.

Author: cjh1

h5cpp/h5capi.h

@@ -0,0 +1,12 @@
+/* This source file is part of the Tomviz project, https://tomviz.org/.
+   It is released under the 3-Clause BSD License, see "LICENSE". */
+
+#ifndef tomvizH5CAPI_h
+#define tomvizH5CAPI_h
+
+extern "C"
+{
+#include <hdf5.h>
+}
+
+#endif // tomvizH5CAPI_h