Add header to pdf parser

Author: RHeckerIntel

lib/utils/pdf_parser.dart

@@ -1,3 +1,7 @@
+// Copyright (c) 2024 Intel Corporation
+//
+// SPDX-License-Identifier: Apache-2.0
+
 import 'dart:convert';
 import 'dart:io';
 import 'dart:typed_data';