Initial Commit

*
Created Tenant Class w/ successful test

* Defined tenant class
  * Fulfilled all req'd specs
  * Created tenant test, tested successfully!
Created Apartment Class, with test file

* Added new class def for apartment
  * Added initialize methods with required (not optional) params
  * Added add tenant method

* Added apartment test file
  * Successfully tested apartment with initialize method.

  *Adding tenant is still untested

* Added more test examples to tenant test file
Updated add tenant method for test cases

* Updated tenant class def to return credit score as a symbol instead of a string.

* Updated add tenant method
  * Exception handling now gets tenant's specific credit rating and evaluates comparison to symbol instead of string
  * If no exceptions, adds new tenant to all tenants array for use in later methods