C# API for speaker diarization (#1407)

scripts/dotnet/FastClusteringConfig.cs

@@ -0,0 +1,20 @@
+/// Copyright (c)  2024  Xiaomi Corporation
+
+using System.Runtime.InteropServices;
+
+namespace SherpaOnnx
+{
+
+    [StructLayout(LayoutKind.Sequential)]
+    public struct FastClusteringConfig
+    {
+        public FastClusteringConfig()
+        {
+            NumClusters = -1;
+            Threshold = 0.5F;
+        }
+
+        public int NumClusters;
+        public float Threshold;
+    }
+}