Commented out legacy code. Started rebuilding basically from scratch
using subroutines and returns. This should make for more robust code
that is easier to maintain.
Added findSubDirs subroutine - returns array of subdirectories within an
argument directory.
Added subroutine to check if m3u exists in current dir.
Reimplemented existing logic to actually create the m3u files.
Fixed usage. Added usage to README.md
Clean-up