Wrap VAD APIs to C# (#946)

scripts/dotnet/SileroVadModelConfig.cs

@@ -0,0 +1,34 @@
+/// Copyright (c)  2024  Xiaomi Corporation (authors: Fangjun Kuang)
+
+using System.Linq;
+using System.Collections.Generic;
+using System.Runtime.InteropServices;
+using System.Text;
+using System;
+
+namespace SherpaOnnx
+{
+    [StructLayout(LayoutKind.Sequential)]
+    public struct SileroVadModelConfig
+    {
+        public SileroVadModelConfig()
+        {
+            Model = "";
+            Threshold = 0.5F;
+            MinSilenceDuration = 0.5F;
+            MinSpeechDuration = 0.25F;
+            WindowSize = 512;
+        }
+
+        [MarshalAs(UnmanagedType.LPStr)]
+        public string Model;
+
+        public float Threshold;
+
+        public float MinSilenceDuration;
+
+        public float MinSpeechDuration;
+
+        public int WindowSize;
+    }
+}