Shopping list v5

https://github.com/Thinkful-Ed/node-shopping-list-v5

• Serves client that:
  • makes AJAX calls back to API endpoints to initially retrieve and display existing recipes and shopping list.
  • allows users to add, check/uncheck, and delete shopping list items
  • allows users to add and delete recipes
• Uses express.Router to route requests for /recipes and /shopping-list to separate modules.
• CRUD (create, read, update, delete) operations for recipes and shopping list
• Note: uses volatile, in memory storage, since we haven't studied data persistence yet in the course.