add: full multi-tenancy control

packages/Webkul/User/src/Models/Group.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace Webkul\User\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Webkul\User\Contracts\Group as GroupContract;
+
+class Group extends Model implements GroupContract
+{
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var array
+     */
+    protected $fillable = [
+        'name',
+        'description',
+    ];
+
+    /**
+     * The users that belong to the group.
+     */
+    public function users()
+    {
+        return $this->belongsToMany(UserProxy::modelClass(), 'user_groups');
+    }
+}