Update main README.md linking audio_to_units README.

README.md

@@ -79,6 +79,9 @@ To reproduce our results, or to evaluate using the same metrics over your own te
 ## Finetuning SeamlessM4T models
 Please check out the [README here](scripts/m4t/finetune/README.md).
 
+## Converting raw audio to units
+Please check out the [README here](scripts/m4t/audio_to_units/README.md).
+
 ## On-device models
 Apart from Seamless-M4T large (2.3B) and medium (1.2B) models, we are also releasing a small model (281M) targeted for on-device inference. To learn more about the usage and model details check out the [README here](docs/m4t/on_device_README.md).