Add documentation for system-wide config feature

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

Author: Copilot

Documentation/config/README.md

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+# System-Wide Configuration
+
+This directory contains an example `config.json` file that can be placed in the application installation directory to override user settings for all users on a machine.
+
+## Usage
+
+1. Copy `config.json.example` to the NETworkManager installation directory (where `NETworkManager.exe` is located)
+2. Rename it to `config.json`
+3. Edit the settings as needed
+4. Restart NETworkManager
+
+## Configuration Options
+
+### Update_DisableUpdateCheck
+
+When set to `true`, disables the automatic update check at startup for all users.
+
+**Example:**
+```json
+{
+  "Update_DisableUpdateCheck": true
+}
+```
+
+This is useful for enterprise deployments where you want to:
+- Control software updates centrally
+- Prevent users from being prompted about updates
+- Disable update checks on multiple machines without user intervention
+
+## File Location
+
+The `config.json` file should be placed in:
+- **Installed version**: `C:\Program Files\NETworkManager\` (or your custom installation path)
+- **Portable version**: Same directory as `NETworkManager.exe`
+
+## Notes
+
+- System-wide configuration takes precedence over user settings
+- If the file doesn't exist or contains invalid JSON, it will be ignored and default user settings will apply
+- Changes to `config.json` require restarting the application to take effect
+- The file is optional - if not present, user settings will be used as normal

Documentation/config/config.json.example

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+{
+  "Update_DisableUpdateCheck": true
+}