Add go-api-examples (#219)

go-api-examples/real-time-speech-recognition-from-microphone/README.md

@@ -0,0 +1,23 @@
+# Introduction
+
+This examples shows how to use the golang package of [sherpa-onnx][sherpa-onnx]
+for real-time speech recognition from microphone.
+
+It uses <https://github.com/gordonklaus/portaudio>
+to read the microphone and you have to install `portaudio` first.
+
+On macOS, you can use
+
+```
+brew install portaudio
+```
+
+and it will install `portaudio` into `/usr/local/Cellar/portaudio/19.7.0`.
+You need to set the following environment variable
+```
+export PKG_CONFIG_PATH=/usr/local/Cellar/portaudio/19.7.0
+```
+
+so that `pkg-config --cflags --libs portaudio-2.0` can run successfully.
+
+[sherpa-onnx]: https://github.com/k2-fsa/sherpa-onnx