Add link to script for simplified model training to FAQ
Add link to script for simplified model training to FAQ

- Add link to a script that trains classifier models given a folder
  with descriptor files

arseneyr/essentia,MTG/essentia,arseneyr/essentia,carthach/essentia,carthach/essentia,MTG/essentia,arseneyr/essentia,carthach/essentia,MTG/essentia,arseneyr/essentia,carthach/essentia,arseneyr/essentia,MTG/essentia,carthach/essentia,MTG/essentia