Add region model

Author: hernanvicente

app/models/region.rb

@@ -0,0 +1,3 @@
+class Region < ApplicationRecord
+  validates :name, presence: true
+end

spec/factories/regions.rb

@@ -0,0 +1,5 @@
+FactoryBot.define do
+  factory :region do
+    name { "The Region" }
+  end
+end

spec/models/region_spec.rb

@@ -0,0 +1,5 @@
+require 'rails_helper'
+
+RSpec.describe Region, type: :model do
+  it { should validate_presence_of(:name) }
+end