Add Preloader to the Landing page

[trishanu-init]

A Preloader should be added to the landing page so that on slow network speeds an animation is shown while the page is loaded.

https://github.com/rahulkamilya/excoders/assets/85580785/00c53f8b-61cf-45f1-a4d2-1fc94d53959e

[trishanu-init]

@rahulkamilya Please assign this issue to me with the hacktoberfest label

[rahulkamilya]

@trishanu-init 🌟 The Repo

[trishanu-init]

@rahulkamilya PR done 👍