Add iOS TTS example for MatchaTTS

[csukuangfj]

Steps to run it on the iOS simulator inside xcode

1. Download and build the code

mkdir -p ~/open-source/
cd ~/open-source
git clone https://github.com/k2-fsa/sherpa-onnx
cd sherpa-onnx
./build-ios.sh

Note that you can put sherpa-onnx anywhere you like. We use ~/open-source as an example

2. Download the tts model

Please refer to
https://k2-fsa.github.io/sherpa/onnx/tts/pretrained_models/matcha.html#matcha-icefall-zh-baker-chinese-1-female-speaker
to download models.

mkdir -p ~/open-source/icefall-models
cd ~/open-source/icefall-models

wget https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/matcha-icefall-zh-baker.tar.bz2
tar xvf matcha-icefall-zh-baker.tar.bz2
rm matcha-icefall-zh-baker.tar.bz2

wget https://github.com/k2-fsa/sherpa-onnx/releases/download/vocoder-models/hifigan_v2.onnx

Note that you can put model files anywhere you like. We use ~/open-source/icefall-models as an example

3. Start xcode

Start xcode and open the project
https://github.com/k2-fsa/sherpa-onnx/tree/master/ios-swiftui/SherpaOnnxTts

4. Add the TTS model to the project

5. Add the vocoder

6. Check that you have added all the required files for Matcha TTS

[csukuangfj]

Here is the version of xcode I am using