add Neo4J usage example to README

README.md

@@ -36,4 +36,13 @@ In order to use that algorithm on custom graph implementation/graph databases, o
 
 ### arebac-neo4j
 
-The `arebac-neo4j` module contains an implementation of `AttributedGraph` that uses an embedded Neo4J database that can be used to evaluate graph patterns against a Neo4J database with the GP-Eval algorithm.
+The `arebac-neo4j` module contains an implementation of `AttributedGraph` that uses an embedded Neo4J database that can be used to evaluate graph patterns against a Neo4J database with the GP-Eval algorithm.
+
+```java
+GraphDatabaseService database = getDatabase();
+GraphPattern pattern = createGraphPattern();
+try(Transaction tx = database.beginTx()){
+	Set<List<Neo4jNode>> results = GPEval.evaluate(dbAsGraph, pattern);
+	System.out.println(results);
+}
+```