Add Feature

This handles Wasp's full-stack feature configuration through a guided workflow. Instead of digging through docs for auth providers, email setup, or Tailwind integration, you get an interactive menu that walks you through one feature at a time. It checks you're in the right directory, asks which feature you want (authentication, database, styling, etc.), then pulls the relevant documentation and guides you through the setup. The approach of showing all options but limiting quick-select choices to the most common ones is smart, keeps things moving without overwhelming you. After each feature it reminds you about environment variables and asks if you want to configure another one. Basically turns Wasp's batteries-included features into a choose-your-own-adventure setup guide.