Made some progress

db/migrate/20160221003140_create_users.rb

@@ -0,0 +1,12 @@
+class CreateUsers < ActiveRecord::Migration
+  def change
+    create_table :users do |t|
+      t.string :email, null: false, default: ''
+      t.integer :account_id, null: false
+
+      t.timestamps null: false
+    end
+
+    add_index :users, :email, unique: true
+  end
+end