Set up Prettier CLI for consistent formatting of code

[swarajpure]

We need the whole codebase to have consistent formatting of the code, otherwise every developer will have their formatter messing up with the formatting of the code

This documentation would help: https://prettier.io/docs/en/install.html

Also, we're having it set up on welcome-site. You can refer: Real-Dev-Squad/website-welcome#120

[swarajpure]

Remember, DO NOT make any other change in the codebase than setting up formatter and changing formatting