The "rails new" README.md should have more guidence

I think the standard README.md could provide more guidance on common commands and getting started.

The reason I suggest this, is because often it’s not changed, which could lead to a negative initial experience (e.g. someone not familiar with rails having to search for the getting setup commands).

If possible, I’d love to see links backs to the documentation, a few recommended gems & commands such rails s and rails g hinted at.

I’d be happy to make a PR for this if it’s agreed it’ll be useful :slight_smile: