Update README.md

Author: rigor789

README.md

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+**The source code has been moved into the main [NativeScript monorepo](https://github.com/NativeScript/NativeScript) and all issues are handled in the main repo now.**
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+**This repository is now in read-only mode (archived) for reference.**
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+---
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 # NativeScript Webpack
 
 This repository contains the code for the nativescript-dev-webpack plugin which helps in webpacking [NativeScript](https://www.nativescript.org/) apps.