Generate a full detail guide for entrepreneurs on writing a one-page business plan. The guide should be clear, concise, and actionable. It must include sections explaining how to define: 1. The Problem You Solve. 2. Your Solution (Product/Service). 3. Your Target Market. 4. Your Competitive Advantage. 5. A Simple Financial Projection. Please include a disclaimer that this is a starting point and not a substitute for a full business plan for investors.