Add project files.

BotExtHost.cs

@@ -0,0 +1,45 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BotBridge;
+
+internal class BotExtHost
+{
+
+    private readonly Stream _stdIn = Console.OpenStandardInput();
+    private readonly Stream _stdOut = Console.OpenStandardOutput();
+
+
+    public void WriteData(byte[] data)
+    {
+        byte[] dataLength = BitConverter.GetBytes(data.Length);
+        if (BitConverter.IsLittleEndian)
+        {
+            Array.Reverse(dataLength);
+        }
+        _stdOut.Write(dataLength, 0, dataLength.Length);
+
+        _stdOut.Write(data, 0, data.Length);
+        _stdIn.Flush();
+    }
+
+    public byte[] ReadData()
+    {
+        byte[] dataLengthBytes = new byte[4];
+        _stdIn.Read(dataLengthBytes, 0, 4);
+        if (BitConverter.IsLittleEndian)
+        {
+            Array.Reverse(dataLengthBytes);
+        }
+        int dataLength = BitConverter.ToInt32(dataLengthBytes, 0);
+
+        byte[] data = new byte[dataLength];
+        _stdIn.Read(data, 0, dataLength);
+        return data;
+    }
+
+
+}