Added user model and fixed reference in migration

db/migrate/20240730214152_create_users.rb

@@ -0,0 +1,13 @@
+class CreateUsers < ActiveRecord::Migration[7.1]
+  def change
+    create_table :users do |t|
+      t.string :firstname
+      t.string :lastname
+
+      t.timestamps
+    end
+
+    add_foreign_key :jobs, :users, column: :operator_id
+    add_foreign_key :jobs, :users, column: :costumer_id
+  end
+end