1. Practice defining a class
2. Build instance methods––both setter and getter

In this lab, you'll be creating a Dog class. Every instance of a Dog should have a name and be able to bark. In other words, I should be able to do:

fido = Dog.new
fido.name = "Fido"

fido.name
# => "Fido"

fido.bark
woof!
# => nil

Run the test suite to get started. You'll be writing all your code in the lib/dog.rb file.

1. Define a class, called Dog.
2. Write a setter method, .name=, that allows you to give a dog a name.
3. Write a getter method, .name that returns an individual dog's name.
4. Write a method, .bark, that puts "woof!" when called on an instance of Dog.

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