Create a Dark Mode switching app

[SayanGuha04]

Is your feature request related to a problem? Please describe.
Create a dark mode switching app using HTML, CSS and JavaScript

Describe the solution you'd like
https://www.youtube.com/watch?v=9LZGB3OLXNQ&list=PLjwm_8O3suyOgDS_Z8AWbbq3zpCmR-WE9&index=15&pp=iAQB

[Gaurang-Khator]

kindly assign this issue to me ! @Sbiswas001 @SayanGuha04

[Sbiswas001]

Assigned to you

[Gaurang-Khator]

@Sbiswas001 Thanks ! Just accept it under Hacktoberfest 2025.