Create a course selling app

• Initialize a new Node.js project
• Add Express, jsonwebtoken to it as a dependency
• Create index.js
• Add route skeleton for user login, signup, purchase a course, see course
• Add routes for admin login, admin signup, create a course, delete a course, add course content.
• Add middlewares for user and admin auth
• Add a database (mongodb), use dotenv to store the database connection string
• Define the schema for User, Admin, Course, Purchase
• Complete the routes for user login, signup, purchase a course, see course