env: Set up Eslint & Prettier and Apply rules

[karatashsyn]

Overview

This pull request aims to improve code quality and define standards by linters and formatters.

Changes Made

Set up EsLint

• Eslint has been set up to force coding standard among the team members.
• Airbnb standards has been selected for the eslint rules.

Set up Prettier

• Prettier has been set up to beautify the format of the codebase. It can be used with VSCode's save on format feature. It will increase readability and make team developers follow some standards.

Forced ESLINT Rules

• Eslint rules has been forced on the codebase with the following command:

npx eslint . --fix