Add tax_references, its controller and some basic pages for viewing ref data about taxes.

test/controllers/tax_references_controller_test.rb

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+require 'test_helper'
+
+class TaxReferencesControllerTest < ActionDispatch::IntegrationTest
+  # test "the truth" do
+  #   assert true
+  # end
+end

test/fixtures/tax_references.yml

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+# Read about fixtures at https://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html
+
+one:
+  year: 1
+  hourly_wage: 1.5
+  min_monthly_hours: 1
+  worker_percentage: 1.5
+  employer_percentage: 1.5
+
+two:
+  year: 1
+  hourly_wage: 1.5
+  min_monthly_hours: 1
+  worker_percentage: 1.5
+  employer_percentage: 1.5

test/models/tax_reference_test.rb

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+require 'test_helper'
+
+class TaxReferenceTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end