Add the voice clone feature of the echo-tts model to the readme page.

Author: kadirnar

README.md

@@ -116,10 +116,18 @@ model = AutoInferenceModel.from_pretrained(
     device="cuda",
 )
 
+# Basic text-to-speech
 output = model(
     text="Hey, here is some random stuff, the text the less likely the model can cope!",
     output_file="output.wav",
 )
+
+# Voice cloning with speaker reference audio
+output = model(
+    text="Hey, here is some random stuff, the text the less likely the model can cope!",
+    speaker_audio_path="reference.wav",
+    output_file="output_cloned.wav",
+)
 ```
 
 ## 🤗 Contributing