Add a personal-finance-for-students book to Books We Trust

Books We Trust covers study skills, focus, habits, and mindset, but has no book on personal finance, even though Financial Literacy & Money Management (a separate section of tools and guides) shows money management is clearly in scope for this list. A trusted, approachable money book aimed at young adults/students is missing. Add 1 reputable personal-finance book aimed at students or young adults, following the format in CONTRIBUTING.md (see the 'For books and textbooks' guidance). Scope: about 15 minutes.