add stars chart (#3084) [skip ci]

Author: robfrank

README.md

@@ -188,6 +188,5 @@ Have fun with data!
 
 The ArcadeDB Team
 
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-
-#### TL;DR: [ArcadeDB](https://arcadedb.com) is an open-source multi-model NoSQL database systems.
+## Stargazers over time
+[![Stargazers over time](https://starchart.cc/ArcadeData/arcadedb.svg?variant=adaptive)](https://starchart.cc/ArcadeData/arcadedb)