Add legacy external storage

Change target / compile sdk to 29

Update gradle, Add demo

Merge branch 'master' of https://github.com/BalioFVFX/Android-Simple-…

…File-Explorer-Library

Merge branch 'master' of https://github.com/BalioFVFX/Android-Simple-…

…File-Explorer-Library

Update README.md

Merge branch 'master' of https://github.com/BalioFVFX/Android-Simple-…

…File-Explorer-Library

New Image View for the selected File Type

Merge branch 'master' of https://github.com/BalioFVFX/Android-Simple-…

…File-Explorer-Library

- File Icon Is Not Showing (BUGFIX)

- Sorting system