Add explanation for using ../enumerables/exercise-1/objects files

[brennacodes]

Within the enumerables exercises, there is an objects directory, and a spec directory. The README.md in both enumerables and exercises makes no mention of what the files located within the objects directory should be used for, or how they should be used. The *_spec.rb files also make no mention of the files, classes, or class attributes within the objects folder.

Recommendation:

• Remove objects directory, or
• Explain what and/or how this directory and its contents should be used in conjunction with the related exercises.