feat.在线安装器，更好的Issue与pull request模板。

LanDesktopPLONDS.installer/Program.cs

@@ -0,0 +1,20 @@
+using Avalonia;
+
+namespace LanDesktopPLONDS.Installer;
+
+public static class Program
+{
+    [STAThread]
+    public static void Main(string[] args)
+    {
+        BuildAvaloniaApp().StartWithClassicDesktopLifetime(args);
+    }
+
+    public static AppBuilder BuildAvaloniaApp()
+    {
+        return AppBuilder.Configure<App>()
+            .UsePlatformDetect()
+            .WithInterFont()
+            .LogToTrace();
+    }
+}