Adds a LICENSE file

LICENSE.md

@@ -0,0 +1,10 @@
+This project is 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.
+
+SPDX-License-Identifier: MIT OR Apache-2.0