Add active development note to readme (#13)

* add disclaimer into readme

Signed-off-by: Hao Wu <skyw@nvidia.com>

* update format

Signed-off-by: Hao Wu <skyw@nvidia.com>

* state APIs are not stable

Signed-off-by: Hao Wu <skyw@nvidia.com>

* Update README.md

---------

Signed-off-by: Hao Wu <skyw@nvidia.com>
Co-authored-by: Eric Harper <complex451@gmail.com>

Author: skyw

README.md

@@ -2,7 +2,10 @@
 
 ## Overview
 
-Emerging Optimizers is a research project focused on understanding and optimizing the algorithmic behavior of Shampoo-class optimizers (Shampoo, SOAP, Muon, etc.) and their implications for performance and GPU systems in large language model training.
+Emerging Optimizers is a research project focused on understanding and optimizing the algorithmic behavior of Shampoo class optimizers (Shampoo, SOAP, Muon, etc.) and their implications to performance of GPU systems in LLM training.
+
+> ⚠️ Note: Emerging-Optimizers is under active development. All APIs are experimental and subject to change. New features, improvements, and documentation updates are released regularly. Your feedback and contributions are welcome, and we encourage you to follow along as new updates roll out.
+
 
 ## Installation