add eval results tip (huggingface#1126)

* add eval results tip

* Update docs/source/index.mdx

Author: burtenshaw

docs/source/index.mdx

@@ -5,6 +5,9 @@
 performance by saving and exploring detailed, sample-by-sample results to debug
 and see how your models stack up.
 
+> [!TIP]
+> Share your evaluation results with the community by pushing them to the Hugging Face Hub. If you open Pull Requests on model repositories with evaluation results, we will automatically show the results on benchmark dataset repositories. Let's decentralize evaluation! Check out the [docs](https://huggingface.co/docs/hub/eval-results).
+
 ## Key Features
 
 ### 🚀 **Multi-Backend Support**