Add sessions controller and login form

app/assets/stylesheets/sessions.scss

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

app/controllers/sessions_controller.rb

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+class SessionsController < ApplicationController
+end

app/helpers/sessions_helper.rb

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+module SessionsHelper
+end

app/views/welcome/index.html.erb

@@ -1 +1,36 @@
-<h3>Welcome to Pretro!</h3>
+<h2 class="ui centered header">Welcome to Pretro!</h2>
+
+<div class="ui container">
+  <div class="ui placeholder segment">
+    <div class="ui two column very relaxed stackable grid">
+      <div class="column">
+        <div class="ui form">
+          <div class="field">
+            <label>Username</label>
+            <div class="ui left icon input">
+              <input type="text" placeholder="Username">
+              <i class="user icon"></i>
+            </div>
+          </div>
+          <div class="field">
+            <label>Password</label>
+            <div class="ui left icon input">
+              <input type="password">
+              <i class="lock icon"></i>
+            </div>
+          </div>
+          <div class="ui blue submit button">Login</div>
+        </div>
+      </div>
+      <div class="middle aligned column">
+        <div class="ui big button">
+          <i class="signup icon"></i>
+          Sign Up
+        </div>
+      </div>
+    </div>
+    <div class="ui vertical divider">
+      Or
+    </div>
+  </div>
+</div>

test/controllers/sessions_controller_test.rb

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