Add a toggle to enable dark/light mode

[iamimmanuelraj]

The Dark/Light mode button serves as an ON|OFF switch which enables you to easily and quickly turn the extension ON or OFF. If you do not like the current theme

PS:- IF MANY PEOPLE ARE ASSIGNED THEN THE ONE TO MAKE PULL REQUEST FIST OR THE ONE TO MAKE PULL REQUEST WITH NEAT AND CLEAN CODE WILL HAVE THEIR PULL REQUEST MERGED

[samyaksand]

Please assign me this issue for the hacktoberfest 2021

[Prit33]

The Dark/Light mode button serves as an ON|OFF switch which enables you to easily and quickly turn the extension ON or OFF. If you do not like the current theme

Hey @Immanuel44 , Please assign it to me under Hacktoberfest 2021

[iamimmanuelraj]

Hey @samyaksand @Prit33 and @SamuelJayasingh and also any further contributors

Hey contributors,
Since many people had asked for an extension for event time we have extended the deadline by a few hours.
Please note that contributions in existing issues are valid before 12am IST today (08/11/2021). If the code is merged before 12am today, it will be eligible for further points.