add item set and menu item set CRUD

spec/views/settings/menu_item_sets/index.html.erb_spec.rb

@@ -0,0 +1,22 @@
+require 'rails_helper'
+
+RSpec.describe "settings/menu_item_sets/index", type: :view do
+  before(:each) do
+    assign(:settings_menu_item_sets, [
+      Settings::MenuItemSet.create!(
+        :item_set_id => nil,
+        :menu_item_id => nil
+      ),
+      Settings::MenuItemSet.create!(
+        :item_set_id => nil,
+        :menu_item_id => nil
+      )
+    ])
+  end
+
+  it "renders a list of settings/menu_item_sets" do
+    render
+    assert_select "tr>td", :text => nil.to_s, :count => 2
+    assert_select "tr>td", :text => nil.to_s, :count => 2
+  end
+end