added tutorials
added README.md
changed README.md
changed README.md
changed README.md
changed README.md
changed README.md
added FileManagementDemo
added indexedTableDemo
added PlaceMarkDemo
added EmailDemo
added EmailDemo
added CameraApp
updated README
added ScalingViewsDemo
Added ImageAspactRatioDemo
Added MessageDemo
Added CopyTextDemo
Added FacebookPostDemo
Added RecordVideoDemo