📝[documentation Update]: upload a video of the website (#521)

<!-- ISSUE & PR TITLE SHOULD BE SAME-->
## Description
Added a video demo of the website.


## Type of PR
<!-- Mention PR Type according to the issue in brackets below and check
the below box -->
- [X] (Documentation)

## Screenshots / videos (if applicable)

![image](https://github.com/user-attachments/assets/582964f3-dfb9-4297-b0b7-e6d918d56107)


## Checklist
<!-- [X] - put a cross/X inside [] to check the box -->
- [X] I have gone through the [contributing
guide](https://github.com/Anjaliavv51/Retro)
- [X] I have updated my branch and synced it with project `main` branch
before making this PR
- [X] I have performed a self-review of my code
- [X] I have tested the changes thoroughly before submitting this pull
request.
- [X] I have provided relevant issue numbers, screenshots, and videos
after making the changes.
- [X] I have commented my code, particularly in hard-to-understand
areas.

README.md

@@ -30,6 +30,11 @@
 </table>
 </div>
 
+# 🎥Demo 
+
+https://github.com/user-attachments/assets/9fbd2c41-09e1-4843-88d5-5ee2e64de43d
+
+
 # Table of Contents
 
 1. [Featured In](#featured-in)