Added initial docs
made some changes
Added something I forget
Added ContentProvider and others
Added unit tests
Added MediaPlayer, Service
Added multithreading techniques
Notifications.txt
added ActivityLifeCycle, CustomThemes
added alot of files
Added hashmap and static
added bitwise ops
lots of multithreading topics
merged
added singleton
changed bitwise ops
updated HashMap
added the apk file format
added Gestures and ViewGroup
refactored design and added Drawing