pygrass manual: progman URL added

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@61969 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/python/docs/src/pygrass_index.rst

@@ -43,6 +43,7 @@ References
 
 * Zambelli P, Gebbert S, Ciolli M., 2013. *Pygrass: An Object Oriented Python Application Programming Interface (API) for Geographic Resources Analysis Support System (GRASS) Geographic Information System (GIS)*. ISPRS International Journal of Geo-Information. 2(1):201-219. `doi:10.3390/ijgi2010201 <http://dx.doi.org/10.3390/ijgi2010201>`_
 * `Python related articles in the GRASS GIS Wiki <http://grasswiki.osgeo.org/wiki/Category:Python>`_
+* `GRASS GIS 7 Programmer's Manual <http://grass.osgeo.org/programming7/>`_
 
 This project has been funded with support from the `Google Summer of Code 2012 <http://trac.osgeo.org/grass/wiki/GSoC#PythonhighlevelmapinteractionforGRASSGIS>`_