Create USING_NEO4J.md

Author: rpiazza

USING_NEO4J.md

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+# Experimenting with the Neo4j graph database Python STIX DataStore
+
+The Neo4j graph database Python STIX DataStore is a proof-of-concept implementation to show how to store STIX content in a graph database. 
+
+## Limitations:
+
+ As a proof-of-concept it is mininal in its functionality.  
+ 
+## Installing Neo4j
+
+## Installing Neo4j python library
+
+## Implementation Details
+
+We would like to that the folks at JHU/APL for their implementation of [STIX2NEO4J.py](https://github.com/opencybersecurityalliance/oca-iob/tree/main/STIX2NEO4J%20Converter), which this code is based on.