Update README.md

Author: cocoindex-dev

README.md

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-CocoIndex is the world's first open-source engine that supports both custom transformation logic and incremental updates specialized for data indexing.
+CocoIndex is ultra performant data transformation framework, core engine written in Rust. The problem it tries to solve is to make it easy to prepare fresh data for AI - either embedding, knowledge graph, or a series of data transformation - and take the real-time data pipeline beyond traditional SQL.
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 <p align="center">
     <img src="https://cocoindex.io/images/cocoindex-features.png" alt="CocoIndex Features" width="500">
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-With CocoIndex, users declare the transformation, CocoIndex creates & maintains an index, and keeps the derived index up to date based on source update, with minimal computation and changes.
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+The philosophy is to have the framework handle the source updates, and having developers only focus on defining a series of data transformation, inspired by spreadsheet.
 
 
 ## Quick Start: