Add whatsnew entry

Author: makbigc

doc/source/whatsnew/v0.25.0.rst

@@ -133,6 +133,7 @@ Other Enhancements
 - :meth:`DataFrame.describe` now formats integer percentiles without decimal point (:issue:`26660`)
 - Added support for reading SPSS .sav files using :func:`read_spss` (:issue:`26537`)
 - Added new option ``plotting.backend`` to be able to select a plotting backend different than the existing ``matplotlib`` one. Use ``pandas.set_option('plotting.backend', '<backend-module>')`` where ``<backend-module`` is a library implementing the pandas plotting API (:issue:`14130`)
+- :meth:`nargsort` handles ``ExtensionArray`` with its ``_values_for_argsort`` method (:issue:`25439`)
 
 .. _whatsnew_0250.api_breaking: