Add project files.

Esiur/Net/Sockets/SocketState.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Esiur.Net.Sockets
+{
+    public enum SocketState
+    {
+        Initial,
+        Listening,
+        Connecting,
+        Established,
+        Closed,
+        Terminated
+    }
+}