Added seeders and seeder folder structure.

database/seeds/constants/ConstantsSeeder.php

@@ -0,0 +1,21 @@
+<?php
+
+use Illuminate\Database\Seeder;
+
+class ConstantsSeeder extends Seeder
+{
+    /**
+     * Run the database seeds.
+     *
+     * @return void
+     */
+    public function run()
+    {
+        $this->call([
+            AccountClassesTableSeeder::class,    
+            AccountTypesTableSeeder::class,    
+            IOTypesTableSeeder::class,
+            ScopesTableSeeder::class
+        ]);
+    }
+}