Adds sample documentation for two separate Neo4j context providers fo…#361

retroryan wants to merge 2 commits intoMicrosoftDocs:mainMicrosoftDocs/semantic-kernel-docs:mainfrom

neo4j-partners:docs/neo4j-context-providerneo4j-partners/semantic-kernel-docs:docs/neo4j-context-providerCopy head branch name to clipboard