Add content for DynamoDB (#6633)

src/data/roadmaps/backend/content/dynamodb@dwfEHInbX2eFiafM-nRMX.md

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 # DynamoDB
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+DynamoDB is a fully managed NoSQL database service provided by AWS, designed for high-performance applications that require low-latency data access at any scale. 
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+It supports key-value and document data models, allowing developers to store and retrieve any amount of data with predictable performance. 
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+DynamoDB is known for its seamless scalability, automatic data replication across multiple AWS regions, and built-in security features, making it ideal for use cases like real-time analytics, mobile apps, gaming, IoT, and more. 
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+Key features include flexible schema design, powerful query capabilities, and integration with other AWS services.