Add TTS example for Java API. (#1176)

It plays the generated audio as it is still generating.

java-api-examples/README.md

@@ -24,6 +24,7 @@ This directory contains examples for the JAVA API of sherpa-onnx.
 ./run-non-streaming-decode-file-nemo.sh
 ```
 
+
 ## Non-Streaming text-to-speech
 
 ```bash
@@ -32,6 +33,12 @@ This directory contains examples for the JAVA API of sherpa-onnx.
 ./run-non-streaming-tts-vits-zh.sh
 ```
 
+## Non-Streaming text-to-speech (Play as it is generating)
+
+```bash
+./run-non-streaming-tts-piper-en-with-callback.sh
+```
+
 ## Spoken language identification
 
 ```bash