I need help making a main menu

You have been hired to write a program to manage inventory and purchases for an ice cream parlor. Your client is asking for the following features to be functional for the next review meeting: 1. Purchase: To sell an ice cream to a customer. 2. Add a new Product: To create a new product and add it to your system. 3. See Inventory: To show the current inventory. 4. Add to Inventory: To add more servings to your inventory. 5. Today's sales: To see the amount of money made in one day. 6. Quit: To logout from the system. You may create as many methods as you find necessary, but the following methods are REQUIRED to earn full credit. Show Menu method: This method displays the main menu. Ice-Cream Parlor Manager! Select option (1 - 5) or 'q' to quit 1. Purchase 2. Add a new product 3. See Inventory 4. Add to inventory 5. Total Sales q. quit