Added awesome-neo4j

[jexp]

https://github.com/neo4j-contrib/awesome-neo4j

The list is about the awesome open source graph database neo4j and it's tools, drivers, query language, places to learn, extensions, related open source projects and more.

Thank you for considering it.

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• I have read and understood the contribution guidelines.
• This pull request has a descriptive title. For example, Add [Name of List], not Update readme.md or Add an awesome list.
• The list I added has been around for at least 20 days,
• The list I added is a non-generated Markdown file in a GitHub repo,
• The list I added is not a duplicate