fix(lib): updates license doc in lib

Author: robgonnella

lib/README.md

@@ -360,6 +360,15 @@ pub struct ScanError {
 
 All scanner operations return `Result<(), ScanError>` for proper error handling.
 
+## License
+
+This project is dual-licensed under either of
+
+- Apache License, Version 2.0 ([LICENSE-APACHE](../LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
+- MIT License ([LICENSE-MIT](../LICENSE-MIT) or http://opensource.org/licenses/MIT)
+
+at your option.
+
 ## Related Projects
 
 - [go-lanscan](https://github.com/robgonnella/go-lanscan) - Original Go implementation