[zenstruck/messenger-test] add recipe (#1189)

zenstruck/messenger-test/1.7/manifest.json

@@ -0,0 +1,6 @@
+{
+    "bundles": {
+        "Zenstruck\\Messenger\\Test\\ZenstruckMessengerTestBundle": ["test"]
+    },
+    "aliases": ["messenger-test"]
+}

zenstruck/messenger-test/1.7/post-install.txt

@@ -0,0 +1,5 @@
+  * You're ready to use zenstruck/messenger-test:
+    1. Override your transport(s) in your <info>test</info> environment with <info>test://</info>
+    2. Use the <info>InteractsWithMessenger</info> trait in your "kernel" tests
+
+  * <fg=blue>Read</> the documentation at <comment>https://github.com/zenstruck/messenger-test#zenstruckmessenger-test</>