Add image to data modeling (#1186)

* Add image to data modeling

* change img

Author: katarinasupe

pages/data-modeling/graph-data-model/lpg-vs-rdf.mdx

@@ -102,6 +102,8 @@ format.
 
 ## Key differences between LPG and RDF
 
+![rdf-vs-lpg](/pages/data-modeling/graph-modeling/rdf-vs-lpg.png)
+
 | **Feature** | **LPG** | **RDF** |
 | --- | --- | --- |
 | **Data Structure** | Labeled nodes and edges with properties | Triples: subject-predicate-object |