docs: adds a description (#2)

Author: TENSIILE

README.md

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+**Saborter Server** – A lightweight [Node.js](https://nodejs.org/en) library that automatically cancels server-side operations when the client aborts a request. Built on the standard [AbortController API](https://developer.mozilla.org/en-US/docs/Web/API/AbortController), it seamlessly with [Express](https://expressjs.com/) framework and allows you to stop unnecessary database queries, file writes, or external API calls, saving server resources and improving scalability. Fully tree‑shakeable – only the code you actually use ends up in your bundle.
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 ## 📚 Documentation
 
 The documentation is divided into several sections: