Plant a root

app/assets/stylesheets/welcome.scss

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+// 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

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+class WelcomeController < ApplicationController
+  def index
+  end
+end

app/helpers/welcome_helper.rb

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+module WelcomeHelper
+end

app/views/welcome/index.html.erb

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+<h1>Kosmos Accounts</h1>
+<p>
+  <%=link_to "Sign up for a new account" %>
+</p>
+<p>
+  <%=link_to "Manage your existing account" %>
+</p>