Added preloader

[Ratnesh4193]

Related Issuse

• Added preloader

Closes: #138

Checklist:

• [X ] My code follows the style guidelines of this project.
• [X ] I have performed a self-review of my own code.
• [ X] I have commented my code, particularly in hard-to-understand areas.
• [ X] My changes generate no new warnings.

Screenshots

Original

https://user-images.githubusercontent.com/57043581/114187545-bf96a680-9965-11eb-9db8-def3e7b2e697.mp4

Updated

https://user-images.githubusercontent.com/57043581/114187588-cb826880-9965-11eb-8746-ce36b34b320d.mp4

Kindly review @CodesbyUnnati

[CodesbyUnnati]

Please make the preloader in some other way, this one doesn't look professional. For reference see- https://netflix-copyby-unnati.netlify.app/. Don't change the opacity if the page.

[CodesbyUnnati]

@Ratnesh4193 This branch is having conflicts, Please resolve them.