Improve accessibility with icon and add documentation to config example

Co-authored-by: BornToBeRoot <16019165+BornToBeRoot@users.noreply.github.com>

Author: Copilot

Source/NETworkManager/Views/SettingsUpdateView.xaml

@@ -7,6 +7,7 @@
              xmlns:localization="clr-namespace:NETworkManager.Localization.Resources;assembly=NETworkManager.Localization"
              xmlns:viewModels="clr-namespace:NETworkManager.ViewModels"
              xmlns:converters="clr-namespace:NETworkManager.Converters;assembly=NETworkManager.Converters"
+             xmlns:iconPacks="http://metro.mahapps.com/winfx/xaml/iconpacks"
              mc:Ignorable="d" d:DataContext="{d:DesignInstance viewModels:SettingsUpdateViewModel}">
     <UserControl.Resources>
         <converters:BooleanReverseConverter x:Key="BooleanReverseConverter" />
@@ -30,10 +31,17 @@
                 </Rectangle.Resources>
             </Rectangle>
         </StackPanel>
-        <TextBlock Text="{x:Static localization:Strings.SettingManagedByAdministrator}"
-                   Foreground="Orange"
-                   Margin="0,0,0,10"
-                   Visibility="{Binding IsUpdateCheckManagedByPolicy, Converter={StaticResource BooleanToVisibilityCollapsedConverter}}" />
+        <StackPanel Orientation="Horizontal" Margin="0,0,0,10"
+                    Visibility="{Binding IsUpdateCheckManagedByPolicy, Converter={StaticResource BooleanToVisibilityCollapsedConverter}}">
+            <Rectangle Width="16" Height="16" Fill="Orange" VerticalAlignment="Center" Margin="0,0,5,0">
+                <Rectangle.OpacityMask>
+                    <VisualBrush Stretch="Uniform" Visual="{iconPacks:Material Kind=ShieldLock}" />
+                </Rectangle.OpacityMask>
+            </Rectangle>
+            <TextBlock Text="{x:Static localization:Strings.SettingManagedByAdministrator}"
+                       Foreground="Orange"
+                       VerticalAlignment="Center" />
+        </StackPanel>
         <mah:ToggleSwitch Header="{x:Static localization:Strings.CheckForPreReleases}"
                           IsOn="{Binding CheckForPreReleases}"
                           Margin="0,0,0,20" />

Source/NETworkManager/config.json.example

@@ -1,3 +1,14 @@
 {
   "Update_DisableUpdateCheck": true
 }
+
+NOTE: This is an example configuration file for system-wide policies.
+To use it:
+1. Rename this file from config.json.example to config.json
+2. Adjust the settings as needed
+3. Place it in the same directory as NETworkManager.exe
+4. Restart NETworkManager
+
+Setting "Update_DisableUpdateCheck" to true will disable the automatic update check
+at startup for all users on this machine. Users will see a message in the settings
+that this option is managed by the administrator.