Add post install message

CloudronManifest.json

@@ -25,5 +25,6 @@
     "https://wordpress.org/about/shots/1.5/front-5.png",
     "https://wordpress.org/about/shots/1.5/front-3.png"
  ],
- "changelog": "file://CHANGELOG"
+ "changelog": "file://CHANGELOG",
+ "postInstallMessage": "file://POSTINSTALL.md"
 }

DESCRIPTION.md

@@ -7,12 +7,6 @@ to transform your site into almost anything you can imagine. Over 60 million
 people have chosen WordPress to power the place on the web they call “home” 
 — we’d love you to join the family.
 
-### Accounts
-
-This app allows any logged in Cloudron user to access the WordPress admin panel.
-Any administator on the Cloudron is automatically made an administrator in WordPress.
-Non-administrators get the default `editor` role in WordPress.
-
 ### Apps
 
 * [Android](https://play.google.com/store/apps/details?id=org.wordpress.android&hl=en)

POSTINSTALL.md

@@ -0,0 +1,5 @@
+This app allows any logged in Cloudron user to access the WordPress admin panel.
+Any administator on the Cloudron is automatically made an administrator in WordPress.
+Non-administrators get the default `editor` role in WordPress.
+
+