add user scaffold

db/migrate/20220227172543_create_users.rb

@@ -0,0 +1,9 @@
+class CreateUsers < ActiveRecord::Migration[7.0]
+  def change
+    create_table :users do |t|
+      t.string :username, null: false, limit: 14, index: true
+
+      t.timestamps
+    end
+  end
+end

db/schema.rb

@@ -10,8 +10,15 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.0].define(version: 0) do
+ActiveRecord::Schema[7.0].define(version: 2022_02_27_172543) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
+  create_table "users", force: :cascade do |t|
+    t.string "username", limit: 14, null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["username"], name: "index_users_on_username"
+  end
+
 end

db/seeds.rb

@@ -1,7 +1,3 @@
-# This file should contain all the record creation needed to seed the database with its default values.
-# The data can then be loaded with the bin/rails db:seed command (or created alongside the database with db:setup).
-#
-# Examples:
-#
-#   movies = Movie.create([{ name: "Star Wars" }, { name: "Lord of the Rings" }])
-#   Character.create(name: "Luke", movie: movies.first)
+User.find_or_create_by(username: 'xpto')
+User.find_or_create_by(username: 'admin')
+User.find_or_create_by(username: 'geonizeli')