user and session generated

app/controllers/sessions_controller.rb

@@ -0,0 +1,10 @@
+class SessionsController < ApplicationController
+  def new
+  end
+
+  def create
+  end
+
+  def welcome
+  end
+end

app/controllers/users_controller.rb

@@ -0,0 +1,10 @@
+class UsersController < ApplicationController
+  def new
+  end
+
+  def create
+    @user = User.create(params.require(:user).permit(:username, :password))
+    session[:user_id] = @user.id
+    redirect_to '/welcome'
+  end
+end