Add dark theme option

[KhushiKhandelwal610]

Please assign it to me under GSSOC'23

[github-actions]

Hi thanks for creating your first issue at Amazing-Python-Scripts, hope you followed the guidelines.

[avinashkranjan]

Go Ahead @KhushiKhandelwal610

[vk20july]

@avinashkranjan sir can i do this task under gssoc'23

[avinashkranjan]

Go Ahead @vk20july