Add Silero VAD (#313)

sherpa-onnx/csrc/README.md

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+# File descriptions
+
+- [./sherpa-onnx-alsa.cc](./sherpa-onnx-alsa.cc) For Linux only, especially for
+  embedded Linux, e.g., Raspberry Pi; it uses a streaming model for real-time
+  speech recognition with a microphone.
+
+- [./sherpa-onnx-microphone.cc](./sherpa-onnx-microphone.cc)
+  For Linux/Windows/macOS; it uses a streaming model for real-time speech
+  recognition with a microphone.
+
+- [./sherpa-onnx-microphone-offline.cc](./sherpa-onnx-microphone-offline.cc)
+  For Linux/Windows/macOS; it uses a non-streaming model for speech
+  recognition with a microphone.
+
+- [./sherpa-onnx.cc](./sherpa-onnx.cc)
+  It uses a streaming model to decode wave files
+
+- [./sherpa-onnx-offline.cc](./sherpa-onnx-offline.cc)
+  It uses a non-streaming model to decode wave files
+
+- [./online-websocket-server.cc](./online-websocket-server.cc)
+  WebSocket server for streaming models.
+
+- [./offline-websocket-server.cc](./offline-websocket-server.cc)
+  WebSocket server for non-streaming models.
+
+- [./sherpa-onnx-vad-microphone.cc](./sherpa-onnx-vad-microphone.cc)
+  Use silero VAD to detect speeches with a microphone.
+