Add AWS neptune content (#6635)

src/data/roadmaps/backend/content/aws-neptune@5xy66yQrz1P1w7n6PcAFq.md

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-# AWS Neptune
+# AWS Neptune
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+AWS Neptune is a fully managed graph database service designed for applications that require highly connected data. 
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+It supports two popular graph models: Property Graph and RDF (Resource Description Framework), allowing you to build applications that traverse billions of relationships with millisecond latency. 
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+Neptune is optimized for storing and querying graph data, making it ideal for use cases like social networks, recommendation engines, fraud detection, and knowledge graphs. 
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+It offers high availability, automatic backups, and multi-AZ (Availability Zone) replication, ensuring data durability and fault tolerance. 
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+Additionally, Neptune integrates seamlessly with other AWS services and supports open standards like Gremlin, SPARQL, and Apache TinkerPop, making it flexible and easy to integrate into existing applications.