debug build title

Bmp.WinForms/Const.cs

@@ -8,6 +8,10 @@ namespace Bmp.WinForms
 {
     internal static class Const
     {
-        internal const string AppTitle = "马鹿音乐播放器";
+        internal const string AppTitle = "马鹿音乐播放器"
+#if DEBUG
+        +"（调试构建）"
+#endif
+            ;
     }
 }