add prettier extension to the workspace and set format on Save=true

[mahmoudmoravej]

Let's recommend installing prettier extension by default.
Also allowing formating on save makes the life less dependent on "yarn format" command

[mahmoudmoravej]

@pbteja1998 if you agree 😄

[jameswinegar]

IDE-specific settings should typically be in .gitignore, and validation should be run via a GitHub action.

[mahmoudmoravej]

IDE-specific settings should typically be in .gitignore, and validation should be run via a GitHub action.

@jameswinegar Any specific reason behind it? There is lots of value for having it while it doesn't affect other IDEs. Remix also use this pattern: https://github.com/remix-run/remix/blob/main/.vscode/extensions.json