Update README.md

Author: nielsdejong

README.md

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 NeoDash is a lightweight web app to create Neo4j dashboards. 
 Writing Cypher is all that's required to build your first dashboard in minutes. Want to give NeoDash a spin right away? Try it here:  https://nielsdejong.nl/neodash/.
 
+You can also install NeoDash on Neo4j Desktop from the [Graph App Gallery](install.graphapp.io/).
+
 ### Features
 - Live reporting on a Neo4j database with a table, graph view, bar chart or line chart.
 - Interactively select parameters to be used as query parameters.