Add NOTICE

Change-Id: Ia65b27333ff4faadeffd86c6c4cd98148cc8e295
diff --git a/NOTICE b/NOTICE
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+The majority of the source code in the mDNSResponder project is licensed
+under the terms of the Apache License, Version 2.0, available from:
+   <http://www.apache.org/licenses/LICENSE-2.0>
+
+To accommodate license compatibility with the widest possible range
+of client code licenses, the shared library code, which is linked
+at runtime into the same address space as the client using it, is
+licensed under the terms of the "Three-Clause BSD License".
+
+The Linux Name Service Switch code, contributed by National ICT
+Australia Ltd (NICTA) is licensed under the terms of the NICTA Public
+Software Licence (which is substantially similar to the "Three-Clause
+BSD License", with some additional language pertaining to Australian law).