Improved User Interface and addition of Easy and Normal Game mode

- updated the Title, Game selection and Game Play user interface
- added easy level (shows wrong and correct selected key characters)
and normal level selection
Fixed Game Win Bug

- fixed game win and game reset bug
- made unplayed game in menu duller
Added Winning Animation and renamed images
Fixed bug and updated User Interface

- changed menu button to custom image button
- game mode label changed
- changed title page background
- removed unused images
Added color distinction in Easy mode

-The color of cryptogram letter answers is now same as answer button
color.

In EASY MODE:
- correct : blue text
- wrong :  red text

In NORMAL MODE:
- all text in blue
fixed conflict