adding in topics langchain core

Author: hamsehmahamud

topics/langchain/index.md

@@ -0,0 +1,13 @@
+---
+aliases: langchain-core
+created_by: hwchase17
+display_name: LangChain
+github_url: https://github.com/langchain-ai/langchain
+logo: langchain.png
+related: artificial-intelligence, llm, prompt-engineering, rag, agents
+short_description: LangChain is an open-source framework designed to simplify the creation of applications using large language models.
+topic: langchain
+url: https://www.langchain.com/
+wikipedia_url: https://en.wikipedia.org/wiki/LangChain
+---
+LangChain is an open-source orchestration framework designed to help developers build context-aware, reasoning applications powered by large language models (LLMs). It provides modular abstractions for document loaders, vector stores, prompt templates, and autonomous agent workflows.