Add Colab example (#67)

Thank you @HarishDevLab for the suggestion, I just reimplemented the PR
to link to a version-controlled notebook.

README.md

@@ -59,6 +59,8 @@ for each voice.
 * [azelma](https://huggingface.co/kyutai/tts-voices/blob/main/vctk/p303_023.wav)
 
 The `--voice` argument can also take a plain wav file as input for voice cloning.
+You can use your own or check out our [voice repository](https://huggingface.co/kyutai/tts-voices).
+
 Feel free to check out the [generate documentation](https://github.com/kyutai-labs/pocket-tts/tree/main/docs/generate.md) for more details and examples.
 For trying multiple voices and prompts quickly, prefer using the `serve` command.
 
@@ -76,6 +78,8 @@ You can check out the [serve documentation](https://github.com/kyutai-labs/pocke
 
 ## Using it as a Python library
 
+You can try out the Python library on Colab [here](https://colab.research.google.com/github/kyutai-labs/pocket-tts/blob/main/docs/pocket-tts-example.ipynb).
+
 Install the package with
 ```bash
 pip install pocket-tts
@@ -90,7 +94,10 @@ import scipy.io.wavfile
 
 tts_model = TTSModel.load_model()
 voice_state = tts_model.get_state_for_audio_prompt(
-    "hf://kyutai/tts-voices/alba-mackenna/casual.wav"
+    "alba"  # One of the pre-made voices, see above
+    # You can also use any voice file you have locally or from Hugging Face:
+    # "./some_audio.wav"
+    # or "hf://kyutai/tts-voices/expresso/ex01-ex02_default_001_channel2_198s.wav"
 )
 audio = tts_model.generate_audio(voice_state, "Hello world, this is a test.")
 # Audio is a 1D torch tensor containing PCM data.