set up a working tenant class with credit score method and add test class
add apartment class with initialize method, change tenant spacing, update test for apartment
add method get add_tenant to apartment class fixed variables in tenant
Adds avg credit score method
Adds building class and adjusts test to work the thing
Adds two new methods for total monthly rev and tenant list
add tenant list and apt by credit (which don't work)
fix apt by credit rating method and did fun things. Everything works