Animal class prompts for information on attributes
Refactor prompts methods out into a separate mixin
Add mixin to prompt user when creating new client
Add menu at start of program
The user is prompted with this menu of options:

display all animals
display all clients
create an animal
create an client
facilitate client adopts an animal
facilitate client puts an animal up for adoption

After selecting from the menu, the user is prompted through the entire process to complete their chosen task.