Class with getters and setter (property)

---

examples/classes/class_with_property.cr

class Person
  property name : String

  def initialize(@name = "George")
  end
end

prs = Person.new(name: "Joe")
p! prs        # prs # => #<Person:0x7f8d0f266e80 @name="Joe">
puts prs.name # Joe
prs.name = "Jane"
puts prs.name # Jane

defaulty = Person.new
puts defaulty.name # George