add libcurl example
add libcurl example

bsn069/luvit,GabrielNicolasAvellaneda/luvit-upstream,bsn069/luvit,zhaozg/luvit,luvit/luvit,luvit/luvit,GabrielNicolasAvellaneda/luvit-upstream,kaustavha/luvit,kaustavha/luvit,GabrielNicolasAvellaneda/luvit-upstream,kaustavha/luvit,bsn069/luvit,zhaozg/luvit,GabrielNicolasAvellaneda/luvit-upstream