feat: add retrieval-augmented-generation topic

topics/rag/index.md

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+---
+aliases: retrieval-augmented-generation, rag-pipeline
+display_name: Retrieval-Augmented Generation
+short_description: Retrieval-augmented generation connects Large Language Models to external knowledge bases to provide accurate responses.
+topic: rag
+logo: rag.png
+wikipedia_url: https://en.wikipedia.org/wiki/Retrieval-augmented_generation
+related: artificial-intelligence, generative-ai, llms, embeddings
+---
+
+Retrieval-augmented generation (RAG) is a technique that improves large language models by retrieving relevant information from external sources and using it to generate more accurate and context-aware responses.
+
+A RAG system combines information retrieval with a language model. It is commonly used in AI assistants, search systems, document question answering, and applications that need access to private or frequently updated information.