Added Edit Text logic and shareButton logic

MainActivity edit text is setup using a new class (TextBuilder).  it pulls text from the edit text view once generate word is clicked, then parses the text into an array list of strings.  When we have the logic for generating a random word the method is in place now to set that word as the next string in the array list.  Two calls to TextBuilder were added to the ShareButton onClick, one calls to a method to build a string (the full message) from the ArrayList of strings (each individual word that was parsed plus the random words) and then the other method is a getter for the full sentence string.