added tray menu

CursorLang/Services/ITrayIcon.cs

@@ -0,0 +1,20 @@
+namespace CursorLang.Services;
+
+/// <summary>
+/// The icon in the notification area — the only face of an application that works
+/// in the background.
+/// </summary>
+public interface ITrayIcon
+{
+    /// <summary>The user asks for the settings window: the icon or its menu.</summary>
+    event EventHandler? OpenRequested;
+
+    /// <summary>The user asks the application to quit. There is no other way out.</summary>
+    event EventHandler? ExitRequested;
+
+    /// <summary>
+    /// Puts the icon into the notification area. Returns <c>false</c> when Windows
+    /// refuses to take it.
+    /// </summary>
+    bool Install();
+}