Add deprecation notice to README

Added deprecation notice and archival information.

Author: deep1401

README.md

@@ -1,5 +1,10 @@
 # Transformer Lab SDK
 
+> ⚠️ **Deprecation Notice**
+> Please Note that we are deactivating this repo soon because we have merged all work from here over to https://github.com/transformerlab/transformerlab-app under the /lab-sdk directory.
+> Please go there for latest updates. This repo will remain available for a while for archival purposes only.
+
+
 Python SDK for interacting with Transformer Lab.
 You can use this to write plugins and ML scripts that integrate with Transformer Lab.