Add realtime data links in Backend roadmap (#7121)

src/data/roadmaps/backend/content/real-time-data@5XGvep2qoti31bsyqNzrU.md

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 # Real Time Data
 
 Real-time data refers to information that is processed and made available immediately or with minimal delay, allowing users or systems to react promptly to current conditions. This type of data is essential in applications requiring immediate updates and responses, such as financial trading platforms, online gaming, real-time analytics, and monitoring systems. Real-time data processing involves capturing, analyzing, and delivering information as it is generated, often using technologies like stream processing frameworks (e.g., Apache Kafka, Apache Flink) and low-latency databases. Effective real-time data systems can handle high-speed data flows, ensuring timely and accurate decision-making.
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+Learn more from the following resources:
+- [@article@Real-time data - Wiki](https://en.wikipedia.org/wiki/Real-time_data)
+- [@article@What is Real-time Data?](https://www.qlik.com/us/streaming-data/real-time-data)