added basic structure for reading response 3
wrote question 1
wrote question 2
removed while loop question
added questions 2 and 3
added example output into file
added reading responses
changed formatting for reading responses so they generate correctly
Merge branch 'problem_set_3' of https://github.com/nickdotreid/runestone into nickdotreid-problem_set_3
updated PS3 and Assignments chapter