fix hidden remind me layout. center no todo imageView

[Garrison88]

Added a scrollView wrapper to 'Remind Me' LinearLayout to prevent soft keyboard from causing an overlap when Title or Description editText gained focus. Also centered the "you dont have any todos" graphic in fragment_main. I formatted the code (ctrl + alt + L in Android Studio) by habit which is why there are so many additions and deletions - I really only added 9 lines of code