fixed "(fix)" fields
added a new class : MainTest
fixed package and new mainTest
added word's content (string) in Word
added javadoc to Word.content
added 2 List on game to store the Words.
create WordsManager to allow a better use of the differents List<Word>
for a Game
added javadoc to Game and add get and set for wordmanager
added javadoc
remake WordManager with an unique List