Fix C# to support Chinese tts models using jieba (#815)

dotnet-examples/offline-tts/run-hf-fanchen.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+set -ex
+if [ ! -f ./vits-zh-hf-fanchen-C/vits-zh-hf-fanchen-C.onnx ]; then
+  curl -SL -O https://github.com/k2-fsa/sherpa-onnx/releases/download/tts-models/vits-zh-hf-fanchen-C.tar.bz2
+  tar xf vits-zh-hf-fanchen-C.tar.bz2
+  rm vits-zh-hf-fanchen-C.tar.bz2
+fi
+
+dotnet run \
+  --vits-model=./vits-zh-hf-fanchen-C/vits-zh-hf-fanchen-C.onnx \
+  --vits-tokens=./vits-zh-hf-fanchen-C/tokens.txt \
+  --vits-lexicon=./vits-zh-hf-fanchen-C/lexicon.txt \
+  --tts-rule-fsts=./vits-zh-hf-fanchen-C/phone.fst,./vits-zh-hf-fanchen-C/date.fst,./vits-zh-hf-fanchen-C/number.fst \
+  --vits-dict-dir=./vits-zh-hf-fanchen-C/dict \
+  --sid=100 \
+  --debug=1 \
+  --output-filename=./fanchen-100.wav \
+  --text="这是一个语音合成测试, 写于公元2024年4月26号, 11点05分，星期5。小米的使命是，始终坚持做'感动人心、价格厚道'的好产品，让全球每个人都能享受科技带来的美好生活。"