Class with declared getter and default value

---

examples/classes/class_with_declared_getter_default.cr

class Person
  getter name : String

  def initialize
    @name = "Default name"
  end
end

prs = Person.new
p! prs        # prs # => #<Person:0x7f804672fe80 @name="Default name">
puts prs.name # Default name

# prs.name = "Joe"
# Error: undefined method 'name=' for Person