Update README.md

README.md

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 - **License:** apache-2.0
 - **Finetuned from model :** unsloth/qwen2.5-7b-unsloth-bnb-4bit
 
-This qwen2 model was trained 2x faster with [Unsloth](https://github.com/unslothai/unsloth) and Huggingface's TRL library.
+This qwen2[1] model was trained 2x faster with [Unsloth](https://github.com/unslothai/unsloth) and Huggingface's TRL library.
+[1] A. Yang et al., “Qwen2 Technical Report,” arXiv preprint arXiv:2407.10671, 2024.