Might be good to add a project level Prettier config

Hi team 👋

I recently opened a PR (thanks for merging it) about a missing link in the docs.
While running the repo locally, I thought it will be good to have a prettier config so that any contributor will not merge their formatting styles. Also, I think it will keep the repo healthy and consistent (since I know you folks are growing and doing more awesome stuff in future!)

Not a big deal, just sharing my thoughts 😄
_Please, feel free to close this PR._