completion of documents web screen added

lib/view_models/final_completion_of_documents_view_model.dart

@@ -0,0 +1,16 @@
+import 'dart:io';
+
+import 'package:file_picker/file_picker.dart';
+import 'package:flutter/material.dart';
+
+class FinalCompletionOfDocumentsViewModel extends ChangeNotifier {
+  final FilePicker _filePicker = FilePicker.platform;
+  File? _selectedFile;
+  File? get selectedFile => _selectedFile;
+
+  Future<void> pickFile() async {
+    final result = await _filePicker.pickFiles();
+    _selectedFile = File(result?.files.single.path ?? '');
+    notifyListeners();
+  }
+}