Add rails_admin_import for easy import in the backoffice.

config/initializers/rails_admin_import.rb

@@ -0,0 +1,25 @@
+RailsAdmin.config do |config|
+  # REQUIRED:
+  # Include the import action
+  # See https://github.com/sferik/rails_admin/wiki/Actions
+  config.actions do
+    all
+    import
+  end
+
+  # Optional:
+  # Configure global RailsAdminImport options
+  config.configure_with(:import) do |config|
+    config.logging = true
+  end
+
+  # Optional:
+  # Configure model-specific options using standard RailsAdmin DSL
+  # See https://github.com/sferik/rails_admin/wiki/Railsadmin-DSL
+  config.model 'User' do
+    import do
+      include_all_fields
+      exclude_fields :secret_token
+    end
+  end
+end