Update README.md (#1164)

README.md

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 A single API encompassing plugin capabilities, context enhancement, and more, saving you backend coding effort
 Visual data analysis, log review, and annotation for applications
 
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 ## Highlighted Features
 **1. LLMs support:** Choose capabilities based on different models when building your Dify AI apps. Dify is compatible with Langchain, meaning it will support various LLMs. Currently supported: