I sprayed the weed killer roundup and wanted to know if I can also spread some lime at the same time to neutralize my acidic garden?
Sure! the glyphosate will still work. Here's what to look out for, though. Don't walk through any bed you've sprayed roundup (even spot sprayed) until all sprayed surfaces have dried over. Then you're good. Even a little bit on your shoes can cause dead/discolored prints all over your lawn.
The easy way to avoid that without taking a break, is, of course, to spread the lime first, and then you can apply roundup right away.