add tips

clashN/clashN/Handler/CoreHandler.cs

@@ -38,6 +38,12 @@ namespace clashN.Handler
                     return;
                 }
 
+                if (item.enableTun && !Utils.IsAdministrator())
+                {
+                    ShowMsg(false, ResUI.EnableTunModeFailed); 
+                    return;
+                }
+
                 SetCore(config, item);
                 string fileName = Utils.GetPath(coreConfigRes);
                 if (CoreConfigHandler.GenerateClientConfig(item, fileName, false, out string msg) != 0)

clashN/clashN/Resx/ResUI.Designer.cs

@@ -1010,5 +1010,12 @@ namespace clashN.Resx
                 return ResourceManager.GetString("NotRunAsAdmin", resourceCulture);
             }
         }
+        internal static string EnableTunModeFailed
+        {
+            get
+            {
+                return ResourceManager.GetString("EnableTunModeFailed", resourceCulture);
+            }
+        }
     }
 }

clashN/clashN/Resx/ResUI.resx

@@ -376,4 +376,7 @@
   <data name="RunAsAdmin" xml:space="preserve">
     <value>Run As Admin</value>
   </data>
+  <data name="EnableTunModeFailed" xml:space="preserve">
+    <value>Failed to enable tun mode, please run as administrator</value>
+  </data>
 </root>

clashN/clashN/Resx/ResUI.zh-Hans.resx

@@ -376,4 +376,7 @@
   <data name="RunAsAdmin" xml:space="preserve">
     <value>以管理员身份运行</value>
   </data>
+  <data name="EnableTunModeFailed" xml:space="preserve">
+    <value>启用 tun 模式失败, 请以管理员身份运行</value>
+  </data>
 </root>