Add the Planetiler NOTICE to the project's NOTICE file. (#920)

* Add the Planetiler NOTICE to the project's NOTICE file. For modifications to third-party original files, we typically need to reflect these changes in the root directory's NOTICE file.

Author: CalvinKirs

NOTICE

@@ -1,8 +1,17 @@
 Apache Baremaps (incubating)
-Copyright 2022-2024 The Apache Software Foundation.
+Copyright 2022-2025 The Apache Software Foundation.
 
 Baremaps development team
 Copyright 2020-2022.
 
 This product includes software developed at
 The Apache Software Foundation (http://www.apache.org/).
+-----------------------------------------------------------------------
+
+This product contains code from Planetiler project
+
+## Licenses
+
+Planetiler licensed under the Apache license, Version 2.0
+
+Copyright 2021 Michael Barry and Planetiler Contributors.