Add missing copyright notice

Author: jbangelo

swiftnav/src/math.rs

@@ -1,3 +1,13 @@
+// Copyright (c) 2025 Swift Navigation Inc.
+// Contact: Swift Navigation <[email protected]>
+//
+// This source is subject to the license found in the file 'LICENSE' which must
+// be be distributed together with this source. All other rights reserved.
+//
+// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
+// EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
+// WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
+
 /// We define a `const` max function since [`std::cmp::max`] isn't `const`
 pub(crate) const fn compile_time_max_u16(a: u16, b: u16) -> u16 {
     if b < a {