Add files via upload

ViewModel/MainViewModel.cs

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+using System.ComponentModel;
+using System.Windows.Input;
+using FileReadAndWrite.Model;
+using FileReadAndWrite.Service;
+using FileReadAndWrite.View;
+
+namespace FileReadAndWrite.ViewModel;
+
+public class MainViewModel : INotifyPropertyChanged {
+    private readonly FileService _fileService;
+    private readonly INavigation _navigation;
+
+    public ICommand EnterRawFileCmd { get; }
+    public ICommand EnterAppDataFileCmd { get; }
+
+    public MainViewModel(INavigation navigation, FileService fileService) {
+        _fileService = fileService;
+        _navigation = navigation;
+
+        EnterRawFileCmd = new Command(async() => await EnterRawFile());
+        EnterAppDataFileCmd = new Command(async() => await EnterAppDataFile());
+    }
+
+    private async Task EnterRawFile(){
+        await _navigation.PushAsync(new RawFilePage(_fileService));
+    }
+
+    private async Task EnterAppDataFile(){
+        await _navigation.PushAsync(new AppDataFilePage());
+    }
+
+    public event PropertyChangedEventHandler? PropertyChanged;
+    public void OnPropertyChanged(string propertyName) {
+        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+    }
+}