docs: added maintainance mode notice to readme

README.md

@@ -9,6 +9,10 @@
 [![Build and Test](https://github.com/andrewcourtice/harlem/actions/workflows/build-and-test.yml/badge.svg)](https://github.com/andrewcourtice/harlem/actions/workflows/build-and-test.yml)
 ![npm](https://img.shields.io/npm/v/harlem)
 
+> [!IMPORTANT]
+> Due to time limitations Harlem has now entered maintainance mode. In future no new features will be added, however, critial bugs will still be addressed and dependencies kept up to date. Contributions are still welcome.
+> For new projects consider using Vue's recommended state management solution, [Pinia](https://pinia.vuejs.org/)
+
 Powerfully simple global state management for Vue 3. Head over to [harlemjs.com](https://harlemjs.com) to get started or take a look at the [demo](https://andrewcourtice.github.io/harlem) to see it in action.
 
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