add relationships for booths

test/factories/booth_requests.rb

@@ -0,0 +1,7 @@
+FactoryGirl.define do
+  factory :booth_request do
+    booth nil
+    user nil
+    role "MyString"
+  end
+end

test/models/booth_request_test.rb

@@ -0,0 +1,7 @@
+require 'test_helper'
+
+class BoothRequestTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end