docs: add dual MIT Apache-2.0 license notice

README.md

@@ -111,4 +111,13 @@ For complete architectural details, see [Architecture Documentation](docs/archit
 
 ## License
 
-Copyright (c) NX9 Systems. All rights reserved.
+Copyright (c) NX9 Systems.
+
+Licensed under either of the following, at your option:
+
+- [MIT License](LICENSE-MIT)
+- [Apache License 2.0](LICENSE-APACHE)
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in this project shall be dual-licensed under the MIT License and
+the Apache License, Version 2.0, without any additional terms or conditions.