chore: add sample code

packages/flutter_password_scoring/example/lib/main.dart

@@ -0,0 +1,119 @@
+import 'dart:isolate';
+
+import 'package:dart_zxcvbn/dart_zxcvbn.dart';
+import 'package:dart_zxcvbn_language_common/dart_zxcvbn_language_common.dart';
+import 'package:dart_zxcvbn_language_en/dart_zxcvbn_language_en.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_password_scoring/flutter_password_scoring.dart';
+
+Future<void> handleScoring(SendPort sendPort) async {
+  ReceivePort receivePort = ReceivePort();
+  sendPort.send(receivePort.sendPort);
+
+  final langCommon = LanguageCommon();
+  final langEn = LanguageEn();
+
+  zxcvbn.setOptions(Options(
+    dictionary: Dictionary.merge([
+      langCommon.dictionary,
+      langEn.dictionary,
+    ]),
+    graphs: langCommon.adjacencyGraphs,
+    translations: langCommon.translations,
+  ));
+
+  // Used to refresh response when locale changes
+  String lastPassword = '';
+
+  await for (var message in receivePort) {
+    if (message is Locale) {
+      zxcvbn.setOptions(Options(
+        translations: message.languageCode == 'en'
+            ? langEn.translations
+            : langCommon.translations,
+      ));
+    } else if (message is String) {
+      lastPassword = message;
+    }
+
+    final result = zxcvbn(lastPassword);
+
+    sendPort.send(result);
+  }
+}
+
+void main() {
+  runApp(const MainApp());
+}
+
+class MainApp extends StatelessWidget {
+  const MainApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      home: Scaffold(
+        body: Center(
+          child: PasswordScoringBuilder(
+            handler: handleScoring,
+            loadingPlaceholder: const CircularProgressIndicator(),
+            builder: (
+              BuildContext context,
+              Result? data,
+              PasswordScoringHelper helper,
+            ) {
+              final TextTheme theme = Theme.of(context).textTheme;
+
+              return Padding(
+                padding: const EdgeInsets.all(16.0),
+                child: ConstrainedBox(
+                  constraints: const BoxConstraints(maxWidth: 400),
+                  child: Column(
+                    mainAxisAlignment: MainAxisAlignment.center,
+                    mainAxisSize: MainAxisSize.min,
+                    crossAxisAlignment: CrossAxisAlignment.stretch,
+                    children: [
+                      TextField(
+                        onChanged: helper.update,
+                        decoration: const InputDecoration(
+                          labelText: 'Password',
+                          border: OutlineInputBorder(),
+                        ),
+                      ),
+                      const SizedBox(
+                        height: 16,
+                      ),
+                      if (data != null)
+                        Column(
+                          children: [
+                            Text('Password: ${data.password}'),
+                            Text('Score: ${data.score} / 4'),
+                            Text('guessesLog10: ${data.guessesLog10}'),
+                            Text('guesses: ${data.guesses}'),
+                            if (data.feedback.warning != null)
+                              Text(
+                                'Warning:',
+                                style: theme.titleMedium,
+                              ),
+                            if (data.feedback.warning != null)
+                              Text(data.feedback.warning!),
+                            const SizedBox(height: 8),
+                            Text(
+                              'Suggestions:',
+                              style: theme.titleMedium,
+                            ),
+                            for (var suggestion in data.feedback.suggestions)
+                              Text(suggestion),
+                          ],
+                        ),
+                    ],
+                  ),
+                ),
+              );
+            },
+          ),
+        ),
+      ),
+    );
+  }
+}