add roles to admin panel

spec/models/role_spec.rb

@@ -0,0 +1,18 @@
+# == Schema Information
+#
+# Table name: roles
+#
+#  id         :bigint           not null, primary key
+#  name       :string
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#
+# Indexes
+#
+#  index_roles_on_name  (name) UNIQUE
+#
+require 'rails_helper'
+
+RSpec.describe Role, type: :model do
+  pending "add some examples to (or delete) #{__FILE__}"
+end