Add a placeholder for a spec
user
```ruby
require 'rspectacular'
require 'referehencible'

class Referenced
  include Referehencible
end

# describe  Referehencible do
#   it { expect(subject).to     allow_value('a' * 32).for :guid }
#   it { expect(subject).not_to allow_value('a' * 33).for :guid }
#   it { expect(subject).not_to allow_value('y' * 32).for :guid }
#
#   it 'cannot create two tokenables with the same guid' do
#     referenced = Referenced.new
#     referenced guid: '3dd76acc3d4a2f2e33b5316500b8a484')
#
#     expect(subject).to validate_uniqueness_of(:guid)
#   end
# end
```
assistant