IANACW, but for me, something energetic and concise like "Help support bringing the world's leading graph DB to Django" helps me get my head in the game a lot faster. I'm closer to "he's making a DB interface for Django" instead of "what is neo4j".

Or even just your opener in your README "neo4django is an Object Graph Mapper that let's you use familiar Django model definitions and queries against the Neo4j graph database" is useful for identifying the players.

Considering the HN audience Django would be known but I'm not sure how many people would know about neo4j. (I hadn't heard of it)