Plant a root

app/assets/stylesheets/welcome.scss

@@ -0,0 +1,3 @@
+// Place all the styles related to the Welcome controller here.
+// They will automatically be included in application.css.
+// You can use Sass (SCSS) here: https://sass-lang.com/

app/controllers/welcome_controller.rb

@@ -0,0 +1,4 @@
+class WelcomeController < ApplicationController
+  def index
+  end
+end

app/helpers/welcome_helper.rb

@@ -0,0 +1,2 @@
+module WelcomeHelper
+end

app/views/welcome/index.html.erb

@@ -0,0 +1,7 @@
+<h1>Kosmos Accounts</h1>
+<p>
+  <%=link_to "Sign up for a new account" %>
+</p>
+<p>
+  <%=link_to "Manage your existing account" %>
+</p>

config/routes.rb

@@ -1,3 +1,4 @@
 Rails.application.routes.draw do
+  root to: 'welcome#index'
   # For details on the DSL available within this file, see https://guides.rubyonrails.org/routing.html
 end