Add tag for TTS as a pipeline so it shows in hf.co/models (#1)

- Add tag for TTS as a pipeline so it shows in hf.co/models (2054cfa567c913a94d9d45454a69cf8f6c85e13a)


Co-authored-by: Omar Sanseviero <osanseviero@users.noreply.huggingface.co>

README.md

@@ -10,6 +10,7 @@ tags:
 - Text-to-Speech
 datasets:
 - LibriTTS
+pipeline_tag: text-to-speech
 ---
 
 ## SpeechT5 TTS Manifest
@@ -46,4 +47,4 @@ If you find our work is useful in your research, please cite the following paper
     year = {2022},
     pages={5723--5738},
 }
-```
+```