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

Start by reading required issues #470 and #471 to understand the expected pieces of the video-recommendation flow. Trace how recommendations are currently displayed and stored, then verify that a user can add a new YouTube video through the website without editing the database directly.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.