Add route for roadmap and its tests

config/routes.rb

@@ -1,5 +1,6 @@
 Rails.application.routes.draw do
   root to: 'static_pages#roadmap'
+  get '/roadmap', to: 'static_pages#roadmap'
 
   namespace :admin do
     root to: 'boards#index'

spec/routing/static_pages_routing_spec.rb

@@ -0,0 +1,13 @@
+require 'rails_helper'
+
+RSpec.describe 'static pages routing', :aggregate_failures, type: :routing do
+  it 'routes roadmap' do
+    expect(get: '/').to route_to(
+      controller: 'static_pages', action: 'roadmap'
+    )
+    
+    expect(get: '/roadmap').to route_to(
+      controller: 'static_pages', action: 'roadmap'
+    )
+  end
+end