Update README to reflect archived status

Added archive notice and updated repository status.

Author: snowmanwwg

README.md

@@ -1,6 +1,6 @@
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-# NeMo DFM: Diffusion Foundation Models
+# NeMo DFM: Diffusion Foundation Models (Archived)
 
 
 <!-- We are still using Mbridge CICD NeMo. @pablo can we get our own? and the same for star gazer-->
@@ -15,6 +15,11 @@
 
 </div>
 
+## Archive Notice
+This repo is being archived. 
+- For diffusion model training using megatron, please refer to [NeMo Megatron-Bridge](https://github.com/NVIDIA-NeMo/Megatron-Bridge)
+- For diffusion model training using pytorch, please refer to [NeMo AutoModel](https://github.com/NVIDIA-NeMo/Automodel)
+
 ## Overview
 
 NeMo DFM (Diffusion Foundation Models) is a library under [NeMo Framework](https://github.com/NVIDIA-NeMo), focusing on diffusion models for **Video**, **Image**, and **Text** generation. It unifies cutting-edge diffusion-based architectures and training techniques, prioritizing efficiency and performance from research prototyping to production deployment.