Added seeders and seeder folder structure.

database/seeds/data/test/TestDataSeeder.php

@@ -0,0 +1,23 @@
+<?php
+
+use Illuminate\Database\Seeder;
+
+class TestDataSeeder extends Seeder
+{
+    /**
+     * Run the database seeds.
+     *
+     * @return void
+     */
+    public function run()
+    {
+        $this->call([
+            TestBookingsTableSeeder::class,
+            TestMemberStatesTableSeeder::class,
+            TestPeopleTableSeeder::class,
+            TestPersonTargetsTableSeeder::class,
+            TestProjectsTableSeeder::class,
+            TestSubBookingsTableSeeder::class
+        ]);
+    }
+}