add folders structure

app/controllers/templates_folders_controller.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+class TemplatesFoldersController < ApplicationController
+  load_and_authorize_resource :template
+
+  def edit; end
+
+  def update
+    @template.folder = TemplateFolders.find_or_create_by_name(current_user, params[:name])
+
+    if @template.save
+      redirect_back(fallback_location: template_path(@template), notice: 'Document template has been moved')
+    else
+      redirect_back(fallback_location: template_path(@template), notice: 'Unable to move template into folder')
+    end
+  end
+
+  private
+
+  def template_folder_params
+    params.require(:template_folder).permit(:name)
+  end
+end