Update README.md

Adding note previous to archive the repo

Author: elbruno

README.md

@@ -1,3 +1,8 @@
+> ⚠️ **This repository is archived.**  
+> All content and ongoing development have been moved to the main **eShopLite** repository: [https://aka.ms/eshoplite/repo](https://aka.ms/eshoplite/repo).  
+> Please use the new repository for the latest updates, issues, and contributions.
+---
+
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