added parameter descriptors for XLSInstanceReader

Change-Id: I47e391a0e54114035b9d0ab061a36b09553f1339
Reviewed-on: http://gerrit.esdi-community.eu/3192
Tested-by: Jenkins <sitemple@igd.fraunhofer.de>
Reviewed-by: Simon Templer <simon.templer@igd.fraunhofer.de>