add folders structure

app/controllers/template_folders_controller.rb

@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+class TemplateFoldersController < ApplicationController
+  load_and_authorize_resource :template_folder
+
+  def show
+    @templates = @template_folder.templates.active.preload(:author).order(id: :desc)
+    @templates = Templates.search(@templates, params[:q])
+
+    @pagy, @templates = pagy(@templates, items: 12)
+  end
+
+  def edit; end
+
+  def update
+    if @template_folder != current_account.default_template_folder &&
+       @template_folder.update(template_folder_params)
+      redirect_to folder_path(@template_folder), notice: 'Folder name has been updated'
+    else
+      redirect_to folder_path(@template_folder), alert: 'Unable to rename folder'
+    end
+  end
+
+  private
+
+  def template_folder_params
+    params.require(:template_folder).permit(:name)
+  end
+end