Merge pull request #325 from Azure/repo-retirement-note

Update README.md

README.md

@@ -1,3 +1,7 @@
+> **IMPORTANT**
+
+> This repository is retired. 
+The OPC Publisher development is being continued in [Azure/Industrial-IoT](https://github.com/Azure/Industrial-IoT). 
 **Please report all OPC Publisher related issues in [Azure Industrial IoT Repository](https://github.com/Azure/Industrial-IoT/).** It contains the latest sources, documentation and will be monitored regularly for issues reported around OPC Publisher.
 
 Please note: This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/). For more information, see the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or contact [opencode@microsoft.com](mailto:opencode@microsoft.com) with any additional questions or comments.