Update README.md

README.md

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 [Facebook's Wav2Vec2](https://ai.facebook.com/blog/wav2vec-20-learning-the-structure-of-speech-from-raw-audio/)
 
-The base model pretrained and fine-tuned on 250 hours of VLSP ASR dataset on 16kHz sampled speech audio. When using the model
+The base model pretrained and fine-tuned on 250 hours of [VLSP ASR dataset](https://vlsp.org.vn/vlsp2020/eval/asr) on 16kHz sampled speech audio. When using the model
 make sure that your speech input is also sampled at 16Khz.
 
 # Usage