Add ESLint run-on-save VSCode settings

[yoshi-pi]

As of #442, settings.json is now added when picking Prettier. How about adding the following setting when picking ESLint as well, so that linting is done on save?

{
  "editor.codeActionsOnSave": {
    "source.fixAll.eslint": "explicit"
  }
}

Related Issue
#302

[cexbrayat]

Hi @yoshi-pi

Yes, I think this would be a good idea.
Would you like to open a PR for this? We would gladly review and merge it.

[yoshi-pi]

@cexbrayat I have opened a PR!

[haoqunjiang]

Released