Update src/uu/dd/src/datastructures.rs

Adds project header to conversion_tables.rs

Co-authored-by: Sylvestre Ledru <sledru@mozilla.com>

src/uu/dd/src/datastructures.rs

@@ -1,3 +1,10 @@
+// This file is part of the uutils coreutils package.
+//
+// For the full copyright and license information, please view the LICENSE
+// file that was distributed with this source code.
+
+// spell-checker:ignore (ToDO) ctable noerror
+
 use crate::conversion_tables::*;
 
 use std::error::Error;