Add a post-install note

Author: sroze

symfony/messenger/4.1/config/packages/messenger.yaml

@@ -1,9 +1,9 @@
 framework:
     messenger:
-        adapters:
-            # Uncomment the following line to enable an adapter named "amqp"
-            # amqp: "%env(MESSENGER_ADAPTER_DSN)%"
+        transports:
+            # Uncomment the following line to enable a transport named "amqp"
+            # default: '%env(MESSENGER_ADAPTER_DSN)%'
 
         routing:
-            # Route your messages to the adapters
+            # Route your messages to the transports
             # 'App\Message\YourMessage': amqp

symfony/messenger/4.1/post-install.txt

@@ -0,0 +1,17 @@
+<bg=blue;fg=white>              </>
+<bg=blue;fg=white> What's next? </>
+<bg=blue;fg=white>              </>
+
+  * You're ready to use the Messenger component. You can define your own message buses
+    or start using the default one right now by injecting the <info>messenger.bus.default</info> service
+    or typehinting <info>Symfony\Component\Messenger\MessageBusInterface</info> in your code.
+
+  * If you need to send messages to your broker, you can benefit from the built-in
+    amqp transport by:
+
+    1. Installing the <info>symfony/serializer-pack</>
+    2. Uncommenting the <comment> MESSENGER_ADAPTER_DSN</> env var
+       and `framework.messanger.transports.amqp` config
+    3. Routing your messages to the amqp sender.
+
+  * <fg=blue>Read</> the documentation at <comment>https://symfony.com/doc/master/messenger.html</>