Update README.md

README.md

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 In this organization, you can find RoLLM models, based on different underlying models and in different flavours (i.e., foundational, instruct, or chat variants). There are currently two collections:
 - RoLlama2: Romanian models based on Llama2
 - RoMistral: Romanian models based on Mistral
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 See details in [https://arxiv.org/abs/2405.07703](https://arxiv.org/abs/2405.07703).  
 
 We encourage the community to engage in discussions (to provide feedback, ask questions, or make improvement suggestions) in Hugging Face or GitHub.