feat(docs): add migration notice

Author: technoph1le

README.md

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 # QuickSnip
 
+> **⚠️ IMPORTANT! ⚠️ QuickSnip is migrating to NextJS. You can view the [nextjs-migration](https://github.com/quicksnip-dev/quicksnip/tree/nextjs-migration) branch here.**
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 QuickSnip is an open-source tool designed for developers who want to organize, search, and share code snippets across various programming languages. It provides a centralized platform for managing handy snippets. Built with love and powered by an awesome community. 🚀
 
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