feat: Add new Structure and Role Eloquent models.

app/Models/Structure.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Structure extends Model
+{
+    protected $fillable = [
+        'name',
+        'slug',
+        'domain',
+        'is_active',
+    ];
+
+    public function users()
+    {
+        return $this->hasMany(User::class);
+    }
+}