Added the Messenger component

Author: javiereguiluz

components.yml

@@ -181,6 +181,14 @@ Lock:
         Creates and manages locks, a mechanism to provide exclusive access to a
         shared resource.
 
+Messenger:
+    slug: messenger
+    docUrl: messenger.html
+    deprecated: false
+    description: |
+        Helps applications send and receive messages to/from other applications
+        using a message bus.
+
 OptionsResolver:
     slug: options-resolver
     docUrl: options_resolver.html