Added overview image

docs/index.rst

@@ -3,10 +3,53 @@ gCube Model
 #############################
 
 
+gCube Model is a resource model built on top of the Information System (IS) Model which captures the different aspects of the resources and their relations playing significant roles in a research infrastructure empowered by gCube. 
+
+
+This Model is part of research conducted in the context of a PhD. This wiki page represents just a partial view of the full rationale of the research. To have a complete overview of the rationale of the model, please refer to the PhD thesis which is publicly available at:
+
+https://etd.adm.unipi.it/t/etd-05102019-114151/
+
+https://openportal.isti.cnr.it/doc?id=people______::470484e51fcb9e307a418c800efc44c8
+
+If you need to refer to such work you can cite the PhD Thesis.
+
+.. code:: 
+
+	@phdthesis{frosini2019transactional,
+	  title={Transactional REST Information System for Federated Research Infrastructures enabling Virtual Research Environments},
+	  author={Frosini, Luca},
+	  year={2019},
+	  school={UNIVERSITÀ DI PISA}
+	}
+
+An previous paper about this work is:
+
+
+
+.. code:: 
+
+	@article{frosini2018facet,
+	  title={A Facet-based Open and Extensible Resource Model for Research Data Infrastructures.},
+	  author={Frosini, Luca and Pagano, Pasquale},
+	  journal={Grey Journal (TGJ)},
+	  volume={14},
+	  number={2},
+	  year={2018}
+	}
+
+
+Overview of gCube Model Resources and (isRelatedTo) Relations
+=============================================================
+
+
+.. image:: ./gcube-reources-and-isrelatedto-relations.png
+
+
+
 .. toctree::
 
 	gcube-model-property.rst
-	
 	gcube-model-facet.rst
 	gcube-model-resource.rst
 	gcube-model-consistsof.rst