Setup user login/logout (#21)

Reviewed-on: #21

app/views/sessions/_form.html.erb

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+<%= form_with(model: session, class: "contents") do |form| %>
+  <% if session.errors.any? %>
+    <div id="error_explanation" class="bg-red-50 text-red-500 px-3 py-2 font-medium rounded-lg mt-3">
+      <h2><%= pluralize(session.errors.count, "error") %> prohibited this session from being saved:</h2>
+
+      <ul>
+        <% session.errors.each do |error| %>
+          <li><%= error.full_message %></li>
+        <% end %>
+      </ul>
+    </div>
+  <% end %>
+
+  <div class="my-5">
+    <%= form.label :email %>
+    <%= form.text_field :email, class: "block shadow rounded-md border border-gray-400 outline-none px-3 py-2 mt-2 w-full" %>
+  </div>
+
+  <div class="my-5">
+    <%= form.label :password %>
+    <%= form.password_field :password, class: "block shadow rounded-md border border-gray-400 outline-none px-3 py-2 mt-2 w-full" %>
+  </div>
+
+  <div class="inline">
+    <%= form.submit class: "rounded-lg py-3 px-5 bg-blue-600 text-white inline-block font-medium cursor-pointer" %>
+  </div>
+<% end %>

app/views/sessions/_session.html.erb

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+<div id="<%= dom_id session %>">
+</div>

app/views/sessions/_session.json.jbuilder

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+json.extract! session, :id, :created_at, :updated_at
+json.url session_url(session, format: :json)

app/views/sessions/new.html.erb

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+<div class="mx-auto md:w-2/3 w-full">
+  <h1 class="font-bold text-4xl">New session</h1>
+
+  <%= render "form", session: @session %>
+
+  <%= link_to "Back to sessions", sessions_path, class: "ml-2 rounded-lg py-3 px-5 bg-gray-100 inline-block font-medium" %>
+</div>