Add authentication

app/views/sessions/new.html.erb

@@ -0,0 +1,11 @@
+<%= tag.div(flash[:alert], style: "color:red") if flash[:alert] %>
+<%= tag.div(flash[:notice], style: "color:green") if flash[:notice] %>
+
+<%= form_with url: session_path do |form| %>
+  <%= form.email_field :email_address, required: true, autofocus: true, autocomplete: "username", placeholder: "Enter your email address", value: params[:email_address] %><br>
+  <%= form.password_field :password, required: true, autocomplete: "current-password", placeholder: "Enter your password", maxlength: 72 %><br>
+  <%= form.submit "Sign in" %>
+<% end %>
+<br>
+
+<%= link_to "Forgot password?", new_password_path %>