Add address factory with randomized attributes

Randomizing all addresses generated will be explored separately.

spec/factories/address_factory.rb

@@ -0,0 +1,11 @@
+FactoryBot.modify do
+  factory :address do
+    trait :randomized do
+      firstname { Faker::Name.first_name }
+      lastname { Faker::Name.last_name }
+      address1 { Faker::Address.street_address }
+      address2 nil
+      phone { Faker::PhoneNumber.phone_number }
+    end
+  end
+end