add readme explain
add readme explain

mtojek/godownloader,zkhadikov/godownloader,mtojek/godownloader,Loafter/godownloader,Loafter/godownloader,zkhadikov/godownloader,mtojek/godownloader,e-tipalchuk/godownloader,Loafter/godownloader,e-tipalchuk/godownloader,e-tipalchuk/godownloader,zkhadikov/godownloader