some progress

app/Models/Permission.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Permission extends Model
+{
+    protected $fillable = [
+        'name',
+        'slug',
+        'description',
+    ];
+
+    public function roles()
+    {
+        return $this->belongsToMany(Role::class, 'permission_role');
+    }
+
+    public function users()
+    {
+        return $this->belongsToMany(User::class, 'permission_user');
+    }
+}