Added Rubocop and initial config

app/controllers/passwords_controller.rb

@@ -1,16 +1,17 @@
+# frozen_string_literal: true
+
 class PasswordsController < ApplicationController
   allow_unauthenticated_access
-  before_action :set_user_by_token, only: %i[ edit update ]
+  before_action :set_user_by_token, only: %i[edit update]
 
-  def new
-  end
+  def new; end
 
   def create
     if user = User.find_by(email_address: params[:email_address])
       PasswordsMailer.reset(user).deliver_later
     end
 
-    redirect_to new_session_path, notice: "Password reset instructions sent (if user with that email address exists)."
+    redirect_to new_session_path, notice: 'Password reset instructions sent (if user with that email address exists).'
   end
 
   def edit
@@ -18,16 +19,17 @@ class PasswordsController < ApplicationController
 
   def update
     if @user.update(params.permit(:password, :password_confirmation))
-      redirect_to new_session_path, notice: "Password has been reset."
+      redirect_to new_session_path, notice: 'Password has been reset.'
     else
-      redirect_to edit_password_path(params[:token]), alert: "Passwords did not match."
+      redirect_to edit_password_path(params[:token]), alert: 'Passwords did not match.'
     end
   end
 
   private
-    def set_user_by_token
-      @user = User.find_by_password_reset_token!(params[:token])
-    rescue ActiveSupport::MessageVerifier::InvalidSignature
-      redirect_to new_password_path, alert: "Password reset link is invalid or has expired."
-    end
+
+  def set_user_by_token
+    @user = User.find_by_password_reset_token!(params[:token])
+  rescue ActiveSupport::MessageVerifier::InvalidSignature
+    redirect_to new_password_path, alert: 'Password reset link is invalid or has expired.'
+  end
 end