README.md: description update.
Resource Update

Updated the resource files to recognize the word goodbye for the potential to
close the program by voice.

File(s):
   modified:   res/codesphinx.corpus
   modified:   res/codesphinx.dic
   modified:   res/codesphinx.lm
   modified:   res/codesphinx.vocab
src/main.c: reduced sleep time after utterance in an attempt to make codesphinx more responsive.