Add users controller

app/controllers/contests_controller.rb

@@ -3,6 +3,7 @@ class ContestsController < ApplicationController
 
   def index
     @contests = current_user.contests
+    @user = current_user
   end
 
   def show

app/controllers/users_controller.rb

@@ -0,0 +1,36 @@
+class UsersController < ApplicationController
+  before_action :set_user, only: %i[ destroy edit update show ]
+
+  def index
+  end
+
+  def edit
+  end
+
+  def update
+    if @user.update(user_params)
+      redirect_to @user
+    else
+      render :edit, status: :unprocessable_entity
+    end
+  end
+
+  def show
+  end
+
+  def new
+  end
+
+  def destroy
+  end
+
+  private
+
+  def set_user
+    @user = User.find(params[:id])
+  end
+
+  def user_params
+    params.expect(user: [ :username, :email_address ])
+  end
+end