Add Cosmos3 family tree graph

README.md

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 # Model Overview: Cosmos3-Super-Image2Video
 
+![Cosmos3 product and examples lineage highlighting Cosmos3-Super-Image2Video](images/cosmos3-super-image2video-graph.png)
+
+The highlighted checkpoint, Cosmos3-Super-Image2Video, is a post-trained image-to-video variant of the Cosmos3-Super base model.
+
 ## Description
 
 Cosmos3 is a collection of Omnimodal world models capable of generating dynamic, high-quality video, image, audio, and action commands from combinations of text, image, video, and action trajectory inputs. It serves as a foundational building block for a broad range of Physical AI applications and research spanning world understanding, world generation, simulation, and embodied policy learning.