Add outdated notice & link to mono-repo (#22)

* Update README.md

Add outdated notice & link to mono-repo

* Update README.md

* Update README.md

---------

Co-authored-by: cmccarthy1 <[email protected]>

Author: Azurethi

README.md

@@ -1,3 +1,13 @@
+# ⚠️ **This repository is outdated!** ⚠️
+
+---
+
+Since 9th October 2024 (the 4.0.0 release of the ML Toolkit), this project has been merged into the ml toolkit mono-repo. For the latest updates and active development, please visit [https://github.com/KxSystems/ml](https://github.com/KxSystems/ml). 
+
+This repository is preserved only to maintain old links and project history but will no longer be actively maintained.
+
+---
+
 # Automated machine learning in kdb+
 
 [![GitHub release (latest by date)](https://img.shields.io/github/v/release/kxsystems/automl)](https://github.com/kxsystems/automl/releases) [![Build Status](https://travis-ci.com/KxSystems/automl.svg?branch=master)](https://travis-ci.com/KxSystems/automl)