Update readme add link to gitbooks
Update readme add link to gitbooks

karmazzin/DrupalConsole,alxvallejo/DrupalConsole,karmazzin/DrupalConsole,reszli/DrupalConsole,karmazzin/DrupalConsole,Cottser/DrupalConsole,alxvallejo/DrupalConsole,reszli/DrupalConsole,reszli/DrupalConsole,dkgndec/DrupalConsole,dkgndec/DrupalConsole,AniRai/DrupalConsole,revagomes/DrupalConsole,revagomes/DrupalConsole,longloop/DrupalConsole,Cottser/DrupalConsole,frega/DrupalConsole,AniRai/DrupalConsole,longloop/DrupalConsole,revagomes/DrupalConsole,longloop/DrupalConsole,Cottser/DrupalConsole,alxvallejo/DrupalConsole,frega/DrupalConsole,dkgndec/DrupalConsole,frega/DrupalConsole,AniRai/DrupalConsole