added cheatsheet activity with chapter view binder class

Signed-off-by: Venkat Prasad <svprasad79@gmail.com>
corrected spellings

Signed-off-by: Venkat Prasad <svprasad79@gmail.com>
layout changes for graph

Signed-off-by: Venkat Prasad <svprasad79@gmail.com>
added open source graph library and activity

Signed-off-by: Venkat Prasad <svprasad79@gmail.com>
adding sample charts

Signed-off-by: Venkat Prasad <svprasad79@gmail.com>
added styles to buttons

Signed-off-by: Venkat Prasad <svprasad79@gmail.com>
added sample graphs

Signed-off-by: Venkat Prasad <svprasad79@gmail.com>
removed exit button

Signed-off-by: Venkat Prasad <svprasad79@gmail.com>
added png logo for all android devices

Signed-off-by: Venkat Prasad <svprasad79@gmail.com>
added few changes

Signed-off-by: xBose79 <spearxsoftware@gmail.com>