Renumber the index of Activity and Layout
Add first practice for linear layout
Add image for padding and margin
Implement linear layout practice for intermediate
Add sample image for linear layout practice
Add readme for a directory description of practices
Implement practice of relative layout for beginner
Implement practice of relative layout for intermediate
Update readme for each project dir
Implement practice of scrollview
Add image for gravity
Add assignment for introduction section
add image for layout-gravity
resize image for layout_sample
Implement practice of framelayout for beginner
Implement practice session of frame layout for intermediate
add image for linear layout
add image for relative layout
add image for frame layout
resize image for layout_sample