Features:
1. Browse files by categories for those popular type(picture, music, video, document, installed applications and so on)
2. Support all basic operations for file/folder
3. Support to mark a file/folder as favorite
4. Support file encryption
Fix crash on android 6.0
9Apps 4.9
![국세청 홈택스 [손택스] on 9Apps](https://go.getnew.app/sg/res/jpg/f7/df/69cc2f90120ec331db2630e0f5b6-6dh.jpg?x-oss-process=style/jmq200)
