added the last two models

db/migrate/20230510184959_create_credentials.rb

@@ -0,0 +1,10 @@
+class CreateCredentials < ActiveRecord::Migration[7.0]
+  def change
+    create_table :credentials do |t|
+      t.string :email
+      t.string :password
+
+      t.timestamps
+    end
+  end
+end