license for small audio sample

[Jonathan Riddell]

Compatible with our policy

"Standalone media files such as images may be licensed under the
Creative Commons Attribution-Share Alike 3.0 Unported licence at
http://creativecommons.org/licenses/by-sa/3.0/ . This does not apply
to icons or anything which is likely to be mixed with content under
our normal (GPL etc) licences."

https://community.kde.org/Policies/Licensing_Policy

Jonathan