public function store($request)
 {
     $project = new Project();
     $project->fill($request);
     $project->save();
     /**
      * Membros
      */
     foreach ($request['members'] as $user_id) {
         $user = User::find($user_id);
         $project->members()->save($user);
     }
     /**
      * Categorias
      */
     foreach ($request['categories'] as $category_id) {
         $category = Category::find($category_id);
         $project->categories()->save($category);
     }
     return $project;
 }