added documentation for .nvmrc usage
added documentation for .nvmrc usage

psychoss/nvm,CristianCantoro/nvm,nontage24/nvm,ljharb/nvm,pmq20/nvm,tlevine/nvm,wahyutaufik/nvm,kmctown/nvm,jhliberty/nvm,cnpm/nvm,wskplho/nvm,jaawerth/nvm,JanChw/nvm,tlevine/nvm,williamboman/nvm,vinaykaradia/clone-nvm,JasonChrYoung/nvm,reybango/nvm,diegofcb10/nvm,michael-ni/nvm,hanhailong/nvm,JasonChrYoung/nvm,dfackler/nvm,nontage24/nvm,Ingelheim/nvm,icyflame/nvm,PeterDaveHelloKitchen/nvm,Salahudeen/nvm,JanChw/nvm,PeterDaveHelloKitchen/nvm,IonicaBizauKitchen/nvm,psychoss/nvm,woss/nvm,elrasguno/nvm,misterdjules/nvm,chinazhaghai/nvm,mirydz/nvm,wahyutaufik/nvm,wskplho/nvm,PeterDaveHello/nvm,sjfkai/nvm,bbuck/nvm,domenicosolazzo/nvm,jbergstroem/nvm,youleiy/nvm,cirosantilli/nvm,gtdeng/nvm,slariviere/nvm,vinaykaradia/clone-nvm,egilkh/nvm,WY08271/nvm,DigitallySeamless/nvm,christophercaburog/nvm,domenicosolazzo/nvm,evocateur/nvm,modulexcite/nvm,cnpm/nvm,kumaria/nvm,creationix/nvm,devedbox/nvm,Ingelheim/nvm,hkdobrev/nvm,bevacqua/nvm,chinazhaghai/nvm,cjac/nvm,egilkh/nvm,IonicaBizauKitchen/nvm,kmctown/nvm,modulexcite/nvm,ljharb/nvm,diegofcb10/nvm,parasaro92/nvm,joneit/nvm,Richardphp/nvm,LeeLovCY/nvm,Kuzirashi/nvm,reybango/nvm,mmorejon/nvm,Theodeus/nvm,Theodeus/nvm,mirydz/nvm,kumaria/nvm,thomasf/nvm,williamboman/nvm,scq000/nvm,greyhwndz/nvm,lukechilds/nvm,scq000/nvm,owen-it/nvm,appleboy/nvm,PeterDaveHello/nvm,lukechilds/nvm,SampleLiao/nvm,parasaro92/nvm,xtuple/nvm,WY08271/nvm,woss/nvm,joneit/nvm,edwmurph/nvm,dfackler/nvm,NicCollins/nvm,Salahudeen/nvm,Kuzirashi/nvm,hanhailong/nvm,evocateur/nvm,elrasguno/nvm,bevacqua/nvm,misterdjules/nvm,jbergstroem/nvm,devedbox/nvm,jaawerth/nvm,SampleLiao/nvm,jhliberty/nvm,owen-it/nvm,creationix/nvm,LeeLovCY/nvm,tianzhihen/nvm,youleiy/nvm,edwmurph/nvm,CristianCantoro/nvm,greyhwndz/nvm,bbuck/nvm,hkdobrev/nvm,pmq20/nvm,tianzhihen/nvm,christophercaburog/nvm,fnogatz/swivm,icyflame/nvm,gtdeng/nvm,cirosantilli/nvm,Richardphp/nvm,mmorejon/nvm,cjac/nvm,thomasf/nvm,michael-ni/nvm,DigitallySeamless/nvm,slariviere/nvm