Docs: add reference to pandaSDMX to the ecosystem

Author: dr-leo

doc/source/ecosystem.rst

@@ -137,6 +137,15 @@ PyDatastream is a Python interface to the
 SOAP API to return indexed Pandas DataFrames or Panels with financial data. 
 This package requires valid credentials for this API (non free).
 
+`pandaSDMX <http://pandasdmx.readthedocs.org>`_
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+pandaSDMX is an extensible library to retrieve and acquire statistical data 
+and metadata disseminated in 
+`SDMX <http://www.sdmx.org>`_ 2.1. This standard is currently supported by 
+the European statistics office (Eurostat)
+and the European Central Bank (ECB). Datasets may be returned as pandas Series 
+or multi-indexed DataFrames.   
+
 
 .. _ecosystem.domain: