Improve code structure

- Add separate API project
- Add notification system

HyperbolicDownloaderApi/Networking/MessageRecivedEventArgs.cs

@@ -0,0 +1,34 @@
+using System.Net;
+using System.Net.Sockets;
+using System.Text;
+using System.Text.Json;
+
+namespace HyperbolicDownloaderApi
+{
+    internal class MessageRecivedEventArgs<T> : EventArgs
+    {
+        private readonly NetworkStream networkStream;
+
+        public MessageRecivedEventArgs(NetworkStream networkStream, IPAddress ipAddress, T data)
+        {
+            this.networkStream = networkStream;
+            Data = data;
+            IpAddress = ipAddress;
+        }
+
+        public T Data { get; set; }
+
+        public IPAddress IpAddress { get; set; }
+
+        public async Task SendResponseAsync(object response)
+        {
+            byte[] bytesToSend = Encoding.ASCII.GetBytes(JsonSerializer.Serialize(response));
+            await networkStream.WriteAsync(bytesToSend);
+        }
+
+        public void SendResponse(object response)
+        {
+            SendResponseAsync(response).GetAwaiter().GetResult();
+        }
+    }
+}