Update README.md

README.md

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 # Dataset Card for Multi-Agent Referential Communication Dataset
 
-![Example scene showing speaker and listener perspectives](assets/main.png)
+<img src="assets/main.png" alt="Example scene" width="400"/>
+
 *Example scene from our environment showing the speaker (left) and listener (right) views. The speaker refers to the target object (blue) while the listener must select the correct referent based on the description without color information.*
 
 ## Dataset Details