add tip in docs and readme referring to lighteval (#618)

README.md

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 </p>
 
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+> **Tip:** For more recent evaluation approaches, for example for evaluating LLMs, we recommend our newer and more actively maintained library [LightEval](https://github.com/huggingface/lighteval).
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 🤗 Evaluate is a library that makes evaluating and comparing models and reporting their performance easier and more standardized. 
 
 It currently contains:

docs/source/index.mdx

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 Visit the 🤗 Evaluate [organization](https://huggingface.co/evaluate-metric) for a full list of available metrics. Each metric has a dedicated Space with an interactive demo for how to use the metric, and a documentation card detailing the metrics limitations and usage.
 
+> **Tip:** For more recent evaluation approaches, for example for evaluating LLMs, we recommend our newer and more actively maintained library [LightEval](https://github.com/huggingface/lighteval).
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 <div class="mt-10">
   <div class="w-full flex flex-col space-y-4 md:space-y-0 md:grid md:grid-cols-2 md:gap-y-4 md:gap-x-5">
     <a class="!no-underline border dark:border-gray-700 p-5 rounded-lg shadow hover:shadow-lg" href="./installation"