Blueprint to write an admin notice (#8)

A tiny blueprint to write a file, place it into the mu-plugins folder
and say hello.

_props for the example to @ironnysh_

blueprints/admin-notice/blueprint.json

@@ -0,0 +1,22 @@
+{
+    "$schema": "https://playground.wordpress.net/blueprint-schema.json",
+    "meta": {
+        "title": "Display Admin Notice ",
+        "description": "Blueprint to add a tiny mu-plugin and display an admin notice",
+        "author": "bph",
+        "categories": ["Admin", "notices"]
+    },
+    "landingPage": "/wp-admin/plugins.php",
+    "steps":[
+        {
+            "step": "login",
+            "username": "admin",
+            "password": "password"
+        },
+        { 
+            "step": "writeFile",
+            "path": "/wordpress/wp-content/mu-plugins/bgnightly-notice.php",
+            "data": "<?php add_action('admin_notices', function() {  echo '<div class=\"notice notice-info is-dismissible\"><p>Hello from Playground.</p></div>'; });"
+        }
+    ]
+}