Update Readme

Author: crossle

README.md

@@ -66,25 +66,28 @@ Once those are implemented, you can build a session in this way:
 If you wanna send message to a group, send a SenderKeyDistributionMessage to all members of the group.
 
 ```dart
-  final senderAddress = SignalProtocolAddress('+00000000001', 1);
-  final groupSender =
-      SenderKeyName('Private group', senderAddress);
-    final aliceStore = InMemorySenderKeyStore();
-    final bobStore = InMemorySenderKeyStore();
-
-    final aliceSessionBuilder = GroupSessionBuilder(aliceStore);
-    final bobSessionBuilder = GroupSessionBuilder(bobStore);
-
-    final aliceGroupCipher = GroupCipher(aliceStore, groupSender);
-    final bobGroupCipher = GroupCipher(bobStore, groupSender);
-
-    final sentAliceDistributionMessage = aliceSessionBuilder.create(groupSender);
-    final receivedAliceDistributionMessage =
-        SenderKeyDistributionMessageWrapper.fromSerialized(
-            sentAliceDistributionMessage.serialize());
-    bobSessionBuilder.process(groupSender, receivedAliceDistributionMessage);
-
-    final ciphertextFromAlice = aliceGroupCipher
-        .encrypt(Uint8List.fromList(utf8.encode('Hello Mixin')));
-    final plaintextFromAlice = bobGroupCipher.decrypt(ciphertextFromAlice);
+  const alice = SignalProtocolAddress('+00000000001', 1);
+  const groupSender = SenderKeyName('Private group', alice);
+  final aliceStore = InMemorySenderKeyStore();
+  final bobStore = InMemorySenderKeyStore();
+
+  final aliceSessionBuilder = GroupSessionBuilder(aliceStore);
+  final bobSessionBuilder = GroupSessionBuilder(bobStore);
+
+  final aliceGroupCipher = GroupCipher(aliceStore, groupSender);
+  final bobGroupCipher = GroupCipher(bobStore, groupSender);
+
+  final sentAliceDistributionMessage =
+      await aliceSessionBuilder.create(groupSender);
+  final receivedAliceDistributionMessage =
+      SenderKeyDistributionMessageWrapper.fromSerialized(
+          sentAliceDistributionMessage.serialize());
+  await bobSessionBuilder.process(
+      groupSender, receivedAliceDistributionMessage);
+
+  final ciphertextFromAlice = await aliceGroupCipher
+      .encrypt(Uint8List.fromList(utf8.encode('Hello Mixin')));
+  final plaintextFromAlice = await bobGroupCipher.decrypt(ciphertextFromAlice);
+  // ignore: avoid_print
+  print(utf8.decode(plaintextFromAlice));
 ```

example/main.dart

@@ -5,6 +5,7 @@ import 'package:libsignal_protocol_dart/libsignal_protocol_dart.dart';
 
 Future<void> main() async {
   await install();
+  await groupTest();
 }
 
 Future<void> install() async {
@@ -79,6 +80,33 @@ Future<void> install() async {
   }
 }
 
+Future<void> groupTest() async {
+  const alice = SignalProtocolAddress('+00000000001', 1);
+  const groupSender = SenderKeyName('Private group', alice);
+  final aliceStore = InMemorySenderKeyStore();
+  final bobStore = InMemorySenderKeyStore();
+
+  final aliceSessionBuilder = GroupSessionBuilder(aliceStore);
+  final bobSessionBuilder = GroupSessionBuilder(bobStore);
+
+  final aliceGroupCipher = GroupCipher(aliceStore, groupSender);
+  final bobGroupCipher = GroupCipher(bobStore, groupSender);
+
+  final sentAliceDistributionMessage =
+      await aliceSessionBuilder.create(groupSender);
+  final receivedAliceDistributionMessage =
+      SenderKeyDistributionMessageWrapper.fromSerialized(
+          sentAliceDistributionMessage.serialize());
+  await bobSessionBuilder.process(
+      groupSender, receivedAliceDistributionMessage);
+
+  final ciphertextFromAlice = await aliceGroupCipher
+      .encrypt(Uint8List.fromList(utf8.encode('Hello Mixin')));
+  final plaintextFromAlice = await bobGroupCipher.decrypt(ciphertextFromAlice);
+  // ignore: avoid_print
+  print(utf8.decode(plaintextFromAlice));
+}
+
 Future<void> groupSession() async {
   const senderKeyName = SenderKeyName('', SignalProtocolAddress('sender', 1));
   final senderKeyStore = InMemorySenderKeyStore();