add missing downloadqueue file
add missing downloadqueue file

ericflo/Sia,mtlynch/Sia,mharkus/Sia,ChrisSchinnerl/Sia,NebulousLabs/Sia,ericflo/Sia,mharkus/Sia,mtlynch/Sia,MrStrong/Sia,MrStrong/Sia,mnsl/Sia,NebulousLabs/Sia,ChrisSchinnerl/Sia,mnsl/Sia