Review changes

README.md

-# Queue Order
-
-## Introduction
+## INTRODUCTION
 
+### Queue Order
 This is the module that provide functionality of sorting
 queue workers definitions. That causes an effect on queue execution order
 during cron run.
 
-## API
+### API
 
 No API.
+  
+
+## REQUIREMENTS
+
+Supported version of the Drupal core.
+
+## INSTALLATION
+
+Install as the usual module. Nothing specific.
 
-## Config
+## CONFIGURATION
 
 All weight values of queue workers stored in `order` property
 of `queue_order.settings` config object. It contains key - value array,
@@ -24,9 +32,9 @@ order:
   queue_worker_3: 1
   queue_worker_4: 2
 ``` 
-## UI
+### UI
 
 This module provide functionality without any admin UI.
 It should be useful on production.
 Use [Queue Order UI](https://www.drupal.org/project/queue_order_ui)
-for development process.  
+for development process.