added HTTPS example

Author: a-brandt

README.md

@@ -374,5 +374,6 @@ Now an edge can be created to set a relation between vertices
 * [Examples](https://github.com/arangodb/arangodb-java-driver/tree/master/src/test/java/com/arangodb/example)
 * [Document examples](https://github.com/arangodb/arangodb-java-driver/tree/master/src/test/java/com/arangodb/example/document)
 * [Graph examples](https://github.com/arangodb/arangodb-java-driver/tree/master/src/test/java/com/arangodb/example/graph)
+* [HTTPS examples](https://github.com/arangodb/arangodb-java-driver/tree/master/src/test/java/com/arangodb/example/ssl)
 * [Tutorial](https://www.arangodb.com/tutorial-java/)