Add link to the janusgraph-visualizer

Signed-off-by: Oleksandr Porunov <[email protected]>

README.md

@@ -41,8 +41,10 @@ provides links to documentation, getting-started guides and release downloads.
 
 ## Visualization
 
-To visualize graphs stored in JanusGraph, you can use any of the following
-tools:
+JanusGraph has a web-based graph visualizer located in [janusgraph-visualizer](https://github.com/JanusGraph/janusgraph-visualizer) 
+repository. 
+
+In additional to the web-based graph visualizer, JanusGraph supports a range of third party graph visualizers listed below:
 
 * [Arcade Analytics](https://arcadeanalytics.com/usermanual/#arcade-analytics)
 * [Cytoscape](https://www.cytoscape.org/)