Added the problem 1, MailProg, from the Problem Set 2
Added the problem 2, ReverseQueue, from the Problem Set 2
Added the problem 3, HtmlNesting, from the Problem Set 2
Added the problem 4, MostFrequentCharacter, from the Problem Set 2
Added the problem 5, Minesweeper, from the Problem Set 2
Includes the starters for the two Assignment 2 projects