createDirectory
Create a new directory (Note, that new files are created via write-calls).
Parameters
uri
The uri of the new folder.
Throws
FileNotFound
FileSystemError.FileNotFound when the parent of uri doesn't exist, e.g. no mkdirp-logic required.
FileExists
FileSystemError.FileExists when uri already exists.
NoPermissions
FileSystemError.NoPermissions when permissions aren't sufficient.