Add initializer generator

Author: ipuchkov

README.md

@@ -21,16 +21,33 @@ And then execute:
 
 ## Usage
 
-Firstly, add `sms_ru.rb` to initializers. Here you can set api_id.
+After you add 'sms_ru' to your Gemfile, you need to run the
+generator:
+
+```console
+rails generate sms_ru:install
+```
+
+The generator will install an initializer to
+`config/initializers/sms_ru.rb`. Here you can set app_id
 
 ``` ruby
   SmsRu.setup do |config|
     config.api_id = Rails.application.secrets.sms_ru_key
-    ### you can setup default settings for every sms.ru API query you want
+  end
+```
+
+Also you can setup default settings for every sms.ru API query
+
+``` ruby
+  SmsRu.setup do |config|
+    ...
     config.queries.sms.send.from = 'fasteria.ru'
   end
 ```
 
+Example:
+
 ``` ruby
   SmsRu.sms.send(api_id: 'abcdef', to: '79112223344', text: 'Sample message') # => '100\n000-00000'
   SmsRu.my.balance # => '100\n87.79'

lib/generators/sms_ru/install/install_generator.rb

@@ -0,0 +1,11 @@
+module SmsRu
+  module Generators
+    class InstallGenerator < Rails::Generators::Base
+       source_root File.expand_path("../templates", __FILE__)
+
+       def copy_initializer
+         template 'sms_ru.rb', 'config/initializers/sms_ru.rb'
+       end
+    end
+  end
+end

lib/generators/sms_ru/install/templates/sms_ru.rb

@@ -0,0 +1,3 @@
+SmsRu.setup do |config|
+  config.api_id = Rails.application.secrets.sms_ru_key
+end