User story: Add new video recommendations

## Background

Your website is getting better and better every day. You feel good and decide to watch some tutorial videos on YouTube. One of them catches your eye and you decide to add it to your video recommendations. However, you realise that currently the only way to add new items is to edit the database directly. That's not too convenient, so you set up to change this! Enhance your website's functionality by enabling users to add video recommendations directly and improving user experience.

## User story 👩🏽‍💻

> ### As a user, I want to add new videos, so I can save new video recommendations for later viewing

## Required issues 🎫

- [ ] #470
- [ ] #471

先阅读必需的 issue #470 和 #471，以了解视频推荐流程中预期包含的部分。跟踪当前推荐的显示和存储方式，然后验证用户是否可以通过网站添加新 YouTube 视频，而无需直接编辑数据库。

由索引模型根据 Issue 内容生成。