src/sage/media/wav.py: Add deprecation to doc

Author: Matthias Koeppe

src/sage/media/wav.py

@@ -23,6 +23,15 @@
 - Bobby Moretti and Gonzalo Tornaria (2007-07-01): First version
 - William Stein (2007-07-03): add more
 - Bobby Moretti (2007-07-03): add doctests
+
+This module (and all of ``sage.media``) is deprecated.
+
+EXAMPLES::
+
+    sage: import sage.media
+    doctest:warning...
+    DeprecationWarning: the package sage.media is deprecated
+    See http://trac.sagemath.org/12673 for details.
 """
 
 import math