print server with new concept

Inspectron.Epson/PrintServer/DiscoveredPrintersReceiver/IDiscoveredPrintersReceiver.cs

@@ -0,0 +1,15 @@
+using Inspectron.Epson;
+
+namespace EpsonPrintService;
+
+/// <summary>
+/// Interface for receiving discovered printer updates
+/// </summary>
+public interface IDiscoveredPrintersReceiver
+{
+    /// <summary>
+    /// Called when the list of discovered printers has changed
+    /// </summary>
+    /// <param name="printers">The current list of discovered printers</param>
+    Task OnPrintersDiscoveredAsync(IReadOnlyList<DiscoveredPrinter> printers);
+}