Deleted database related code.
Removed sync icon.
Adding three level expandable menu.
Lower the minimum Android version.
Deleted unnecessary files.
Added display of instruction image.
adjusged image display for both instruction image and question image
Removed logging code.
capped maximum width of scaling of images
more width adjusting
adjust most instruction image to full screen width
adjusted width for landscape display
Create README.md
Update README.md
Added back jar files.
Added back database files.