add folders migration

db/migrate/20230920195319_create_template_folders.rb

@@ -0,0 +1,15 @@
+# frozen_string_literal: true
+
+class CreateTemplateFolders < ActiveRecord::Migration[7.0]
+  def change
+    create_table :template_folders do |t|
+      t.string :name, null: false
+
+      t.references :author, null: false, foreign_key: { to_table: :users }, index: true
+      t.references :account, null: false, foreign_key: true, index: true
+
+      t.datetime :deleted_at
+      t.timestamps
+    end
+  end
+end