docs(Clients): Add community Apache Spark Connector. (#5859)

From #2123. This Spark connector connects to Dgraph over gRPC. This connector comes from @EnricoMi. Thanks for your contribution!
dgraph-io · Jul 7, 2020 · 4c352c9 · 4c352c9
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diff --git a/wiki/content/clients/index.md b/wiki/content/clients/index.md
@@ -524,6 +524,10 @@ These third-party clients are contributed by the community and are not officiall
 - https://github.com/Swoorup/dgraph-rs
 - https://github.com/selmeci/dgraph-tonic
 
+### Apache Spark Connector
+
+- https://github.com/G-Research/spark-dgraph-connector
+
 ## Raw HTTP
 
 {{% notice "warning" %}}