add message model and migration

db/migrate/20220512140948_create_messages.rb

@@ -0,0 +1,11 @@
+class CreateMessages < ActiveRecord::Migration[6.0]
+  def change
+    create_table :messages do |t|
+      t.string :title
+      t.text :description
+      t.string :email, null: false
+      t.string :phone
+      t.timestamps
+    end
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2022_05_12_124755) do
+ActiveRecord::Schema.define(version: 2022_05_12_140948) do
 
   create_table "active_admin_comments", force: :cascade do |t|
     t.string "namespace"
@@ -38,4 +38,13 @@ ActiveRecord::Schema.define(version: 2022_05_12_124755) do
     t.index ["reset_password_token"], name: "index_admin_users_on_reset_password_token", unique: true
   end
 
+  create_table "messages", force: :cascade do |t|
+    t.string "title"
+    t.text "description"
+    t.string "email", null: false
+    t.string "phone"
+    t.datetime "created_at", precision: 6, null: false
+    t.datetime "updated_at", precision: 6, null: false
+  end
+
 end

db/seeds.rb

@@ -5,5 +5,7 @@
 #
 #   movies = Movie.create([{ name: 'Star Wars' }, { name: 'Lord of the Rings' }])
 #   Character.create(name: 'Luke', movie: movies.first)
-AdminUser.create!(email: 'admin@example.com', password: 'password', password_confirmation: 'password') if Rails.env.development?
-AdminUser.create!(email: 'bijan@example.com', password: '1234567890', password_confirmation: '1234567890') if Rails.env.development?
+if Rails.env.development?
+  AdminUser.create!(email: 'admin@example.com', password: 'password', password_confirmation: 'password')
+  AdminUser.create!(email: 'bijan@example.com', password: '1234567890', password_confirmation: '1234567890')
+end