adds settings area to admin

app/controllers/admin/settings_controller.rb

@@ -0,0 +1,17 @@
+class Admin::SettingsController < Admin::BaseController
+
+  def index
+    @settings = Setting.all
+  end
+
+  def update
+    @setting = Setting.find(params[:id])
+    @setting.update(settings_params)
+    redirect_to admin_settings_path, notice: t("admin.settings.flash.updated")
+  end
+
+  private
+    def settings_params
+      params.require(:setting).permit(:value)
+    end
+end