Added UpateCheckService usage example

ghost/update-check-service/README.md

@@ -11,7 +11,56 @@ or
 
 
 ## Usage
+Check the UpdateCheckService's constructor JSDoc for the list of available parameters. This is how the service is initialized in Ghost:
+```js
+const api = require('./api').v2;
+const GhostMailer = require('./services/mail').GhostMailer;
+const config = require('../shared/config');
+const urlUtils = require('./../shared/url-utils');
 
+const i18n = require('../shared/i18n');
+const logging = require('../shared/logging');
+const request = require('./lib/request');
+const ghostVersion = require('./lib/ghost-version');
+const UpdateCheckService = require('@tryghost/update-check-service');
+
+const updateChecker = new UpdateCheckService({
+    api: {
+        settings: {
+            read: api.settings.read,
+            edit: api.settings.edit
+        },
+        posts: {
+            browse: api.posts.browse
+        },
+        users: {
+            browse: api.users.browse
+        },
+        notifications: {
+            add: api.notifications.add
+        }
+    },
+    config: {
+        mail: config.get('mail'),
+        env: config.get('env'),
+        databaseType: config.get('database').client,
+        checkEndpoint: config.get('updateCheck:url'),
+        isPrivacyDisabled: config.isPrivacyDisabled('useUpdateCheck'),
+        notificationGroups: config.get('notificationGroups'),
+        siteUrl: urlUtils.urlFor('home', true),
+        forceUpdate: config.get('updateCheck:forceUpdate'),
+        ghostVersion: ghostVersion.original
+    },
+    i18n,
+    logging,
+    request,
+    sendEmail: ghostMailer.send
+});
+
+// run the update check with 
+
+updateChecker.check();
+```
 
 ## Develop