docs: Add top-level LICENSE file for OpenSSF badge compliance

The OpenSSF Best Practices badge automation requires a file named
LICENSE at the repository root. The project already has LICENSE-MIT
and LICENSE-APACHE, but the automated checker does not recognize
those names. Add a top-level LICENSE that references both files.

Assisted-by: AI
Signed-off-by: gursewak1997 <gursmangat@gmail.com>

Author: gursewak1997

LICENSE

@@ -0,0 +1,7 @@
+This project is dual-licensed under the MIT License and the Apache License,
+Version 2.0. You may choose either license at your option.
+
+See LICENSE-MIT for the MIT License.
+See LICENSE-APACHE for the Apache License, Version 2.0.
+
+SPDX-License-Identifier: MIT OR Apache-2.0