Add documentation on configuration

README.md

@@ -65,6 +65,17 @@ You have your Rails application deployed on the [Amazon Elastic Beanstalk](http:
 
 9. Deploy the application to both environments (web and worker).
 
+## Optional configuration
+This gem is configurable in case your setup requires different settings than the defaults.  
+
+  ```Ruby
+  Rails.application.configure do
+    config.active_elastic_job.process_jobs = # defaults to ENV['PROCESS_ACTIVE_ELASTIC_JOBS'] == 'true' || false
+    config.active_elastic_job.aws_credentials = # defaults to Aws::InstanceProfileCredentials.new
+    config.active_elastic_job.secret_key_base = # defaults to Rails.application.secrets[:secret_key_base]
+  end
+  ```
+
 ## FAQ
 A summary of frequently asked questions:
 ### What are the advantages in comparison to popular alternatives like Resque, Sidekiq or DelayedJob?

spec/integration/rails-app-5.0/config/environments/production.rb

@@ -76,4 +76,9 @@
 
   # Do not dump schema after migrations.
   config.active_record.dump_schema_after_migration = false
+
+  # Test gem's configuration
+  config.active_elastic_job.process_jobs = true
+  config.active_elastic_job.aws_credentials = Aws::Credentials.new(ENV['AWS_ACCESS_KEY_ID'], ENV['AWS_SECRET_ACCESS_KEY'])
+  config.active_elastic_job.secret_key_base = 's3krit'
 end