Add install task

New meilisearch:install task creates an initializer file

README.md

@@ -110,11 +110,17 @@ Create a new file `config/initializers/meilisearch.rb` to setup your `MEILISEARC
 
 ```ruby
 MeiliSearch::Rails.configuration = {
-  meilisearch_url: 'YourMeilisearchUrl', # example: http://localhost:7700
-  meilisearch_api_key: 'YourMeilisearchAPIKey',
+  meilisearch_url: ENV.fetch('MEILISEARCH_HOST', 'http://localhost:7700'),
+  meilisearch_api_key: ENV.fetch('MEILISEARCH_API_KEY', 'YourMeilisearchAPIKey')
 }
 ```
 
+Or you can run a rake task to create the initializer file for you:
+
+```bash
+bin/rails meilisearch:install
+```
+
 The gem is compatible with [ActiveRecord](https://github.com/rails/rails/tree/master/activerecord), [Mongoid](https://github.com/mongoid/mongoid) and [Sequel](https://github.com/jeremyevans/sequel).
 
 ⚠️ Note that even if you want to use all the default options, you must declare an empty `meilisearch` block in your model.  

lib/meilisearch/rails/tasks/meilisearch.rake

@@ -19,4 +19,11 @@ namespace :meilisearch do
 
     MeiliSearch::Rails::Utilities.clear_all_indexes
   end
+
+  desc 'Create initializer file'
+  task install: :environment do
+    puts 'Creating initializer file'
+
+    copy_file "#{__dir__}/../templates/initializer.rb", "config/initializers/meilisearch.rb"
+  end
 end

lib/meilisearch/rails/templates/initializer.rb

@@ -0,0 +1,4 @@
+MeiliSearch::Rails.configuration = {
+  meilisearch_url: ENV.fetch('MEILISEARCH_HOST', 'http://localhost:7700'),
+  meilisearch_api_key: ENV.fetch('MEILISEARCH_API_KEY', 'YourMeilisearchAPIKey')
+}