chore: add prettier config for consistent formatting

[gelocraft]

What I've done:

• add prettier config file that follows your javascript coding standards
• add eslint-config-prettier and eslint-plugin-prettier as dev deps (to make prettier compatible with eslint)
• update npm run lint script to eslint . && prettier --check .

Note

Merging this PR immediately will make the ci lint fail for this branch and for the next/upcoming pull requests in this repo because of the extra whitespaces reported by prettier/prettier from eslint-plugin-prettier

Solution:
run npx prettier --write . to remove all the extra whitespaces in this repo

here's the output of npm run lint after running npx prettier --write .:

This won't make the ci lint fail because the exit code now is 0.

If this PR has been approved (don't merge yet), I will add two more commits in this branch.

• The first commit formats this repo by running npx prettier --write . .
• And the second commit removes all the unused eslint inline rules warning.

[github-actions]

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[gelocraft]

How do I sign the CLA? I want to contribute in this project

[gelocraft]

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