add ref link for mos prediction

app.py

@@ -314,7 +314,8 @@ Music score usually includes lyrics, as well as duration and pitch of each word
 <p>References: <a href="https://arxiv.org/abs/2409.07226">Muskits-ESPnet paper</a> |
 <a href="https://github.com/espnet/espnet">espnet</a> |
 <a href="https://huggingface.co/espnet/aceopencpop_svs_visinger2_40singer_pretrain">Model①(Chinese)</a> |
-<a href="https://huggingface.co/espnet/mixdata_svs_visinger2_spkembed_lang_pretrained">Model②(Multilingual)</a></p>
+<a href="https://huggingface.co/espnet/mixdata_svs_visinger2_spkembed_lang_pretrained">Model②(Multilingual)</a> |
+<a href="https://github.com/South-Twilight/SingMOS">SingMOS</a></p>
 
 </div>
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