Update setup

README.md

@@ -39,6 +39,15 @@ You need to generate these secrets:
 
 ## Usage
 
+In your Puppetfile include:
+
+```ruby
+mod 'mastodon',
+    :git => 'https://codeberg.org/adelgado/puppet-mastodon.git',
+    :branch => 'production'
+```
+
+Hiera data to set up the instance:
 ```yaml
 classes:
   - mastodon