Neo4j conversation cypher template (#12927)

Adding custom graph memory to Cypher chain

---------

Co-authored-by: Erick Friis <erick@langchain.dev>

templates/neo4j-cypher-memory/main.py

@@ -0,0 +1,23 @@
+from neo4j_cypher_memory.chain import chain
+
+if __name__ == "__main__":
+    original_query = "Who played in Top Gun?"
+    print(
+        chain.invoke(
+            {
+                "question": original_query,
+                "user_id": "user_123",
+                "session_id": "session_1",
+            }
+        )
+    )
+    follow_up_query = "Did they play in any other movies?"
+    print(
+        chain.invoke(
+            {
+                "question": follow_up_query,
+                "user_id": "user_123",
+                "session_id": "session_1",
+            }
+        )
+    )