I'd say you found yourself a domestic tabby. Though if you take a picture of the whole body, or a side view to see it's markings, it might be easier to tell for sure. But from the look it's just a adorable tabby kitten as for breed specific there is no way to say for sure as that you found it outside. Domestic basically from what I understand means mix breed. So I'd say your kitten is a domestic shorthair or medium haired tabby.