Class with property with default value

---

examples/classes/class_with_default_property.cr

class Person
  property name : String

  def initialize
    @name = "Default name"
  end
end

prs = Person.new
p! prs        # prs # => #<Person:0x7fa3aaae2eb0>
puts prs.name # Default name
prs.name = "Joe"
puts prs.name # joe