[flutter_secure_storage] Add commit about generate secret key

packages/flutter_secure_storage/flutter_secure_storage_aurora/README.md

@@ -25,6 +25,7 @@ import 'package:flutter_secure_storage_aurora/flutter_secure_storage_aurora.dart
 // https://pub.dev/packages/encrypt
 // Encrypter(AES(key))
 // secure-random --length 16 --base 16
+// You can generate a secret key based on user data, as an example of a hash pincode
 FlutterSecureStorageAurora.setSecret('5872747ed1ceda363808efb8b2b18b20');
 
 final storage = const FlutterSecureStorage();

packages/flutter_secure_storage/flutter_secure_storage_aurora/example/lib/main.dart

@@ -36,6 +36,7 @@ class _MyAppState extends State<MyApp> {
       // https://pub.dev/packages/encrypt
       // Encrypter(AES(key))
       // secure-random --length 16 --base 16
+      // You can generate a secret key based on user data, as an example of a hash pincode
       FlutterSecureStorageAurora.setSecret('5872747ed1ceda363808efb8b2b18b20');
 
       const key = 'my_key';
@@ -111,8 +112,7 @@ class _MyAppState extends State<MyApp> {
                           padding: const EdgeInsets.all(20),
                           decoration: const BoxDecoration(
                             color: Colors.green,
-                            borderRadius:
-                                BorderRadius.all(Radius.circular(10.0)),
+                            borderRadius: BorderRadius.all(Radius.circular(10.0)),
                           ),
                           child: const Text(
                             'Demo application demonstration implementation of flutter_secure_storage',

packages/flutter_secure_storage/flutter_secure_storage_aurora/lib/flutter_secure_storage_aurora.dart

@@ -15,6 +15,7 @@ class FlutterSecureStorageAurora extends FlutterSecureStoragePlatform {
   /// https://pub.dev/packages/encrypt
   /// Encrypter(AES(key))
   /// secure-random --length 16 --base 16
+  /// You can generate a secret key based on user data, as an example of a hash pincode
   static void setSecret(String secret) {
     _api = FlutterSecureStorageAuroraApi(
       secret,