In this task, the job is to create a new empty file called "output.txt" of size 0 bytes
and an empty directory called "docs". This should be done twice: once "here", i.e. in the current working directory and once in the filesystem root.

let val out = TextIO.openOut "output.txt" in
  TextIO.closeOut out
end;
 
OS.FileSys.mkDir "docs";