add admin user by devise

app/views/devise/sessions/new.html.erb

@@ -0,0 +1,28 @@
+<h1><%= t('.sign_in') %></h1>
+
+<%= form_for(resource, as: resource_name, url: session_path(resource_name)) do |f| %>
+  <div class="form-group">
+    <%= f.label :email %>
+    <%= f.email_field :email, autofocus: true, autocomplete: 'email', class: 'form-control' %>
+  </div>
+
+  <div class="form-group">
+    <%= f.label :password %>
+    <%= f.password_field :password, autocomplete: 'current-password', class: 'form-control' %>
+  </div>
+
+  <% if devise_mapping.rememberable? %>
+    <div class="form-group form-check">
+      <%= f.check_box :remember_me, class: 'form-check-input' %>
+      <%= f.label :remember_me, class: 'form-check-label' do %>
+        <%= resource.class.human_attribute_name('remember_me') %>
+      <% end %>
+    </div>
+  <% end %>
+
+  <div class="form-group">
+    <%= f.submit  t('.sign_in'), class: 'btn btn-primary' %>
+  </div>
+<% end %>
+
+<%= render 'devise/shared/links' %>