created exercise 7 but spelt it wrong so as to preserve the convention
copied has w/ students into it
added students_per_cohort method
fixed stuedns per cohort method
outputs the cohort names
made a method for increasing student amount
applied method for increasing student amount by a percentage
still getting the hang of this git business
fixed order
deleted second cohort
added add-all-students method
fixed order
added output
BONUS QUESTION COMPLETED