1. Product and Attributes
- Create a class Product with two member attributes called name and price. Their
  types should be std::string and double. Create an object called beverage in
  main function. Set name and price to "coffee" and 1.5. Print name and price.
- Learn: class and object creation, public, access and usage of member
  attributes,


2. Product and Default Constructor
- Continue from exercise 1.
- Add a default constructor into class Product. Initialize name and price to
  "null" and 0. Add print into constructor that tells the name of a Product
  object and that we are in a constructor. Add a destructor. Add a print into
  destructor that tells the name of the Product object and that we are in a
  destructor. Create new object called sandwich after printing details of
  coffee object. Print name and price of the sandwich as for the coffee.
- Learn: default constructor and destructor


3. Product and Parameterized Constructor
- Continue from exercise 2.
- Add parameterized constructor accepting two parameters: name and price as
  std::string and double. Add a print into the parameterized constructor
  about calling it and print the name of the Product object too. Change
  instantiation of the coffee object to use the new parameterized constructor.
  Don't remove setting name and price for coffee yet.
  Compiler should warn about shadowed members. Fix issue by renaming member
  attributes to mName and mPrice. Alternatively m_name or name_ naming scheme
  can be used as well.
- Learn: parameterized constructor
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