add info about datasets and models (#1)

- add info about datasets and models (cf70bbdf57bc34cf7b430ca4e4d0c0f0d8ccad40)

README.md

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 Big Code is an open scientific collaboration working on responsible training of large language models for coding applications.
 
 You can find more information on the main website at <a href="https://www.bigcode-project.org/" class="underline">https://www.bigcode-project.org</a>. You can also follow Big Code on Twitter at <a href="https://twitter.com/BigCodeProject" class="underline">https://twitter.com/BigCodeProject</a>.
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+In this organization, you can find <a href="https://huggingface.co/datasets/bigcode/the-stack" class="underline">The Stack</a>, a 3.1TB of source code in 30 programming languages, its near deduplicated version and a small subset.
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+If you want to access the models trained on these datasets, please send a request to contact@bigcode-project.org.
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