Update Readme.md - How to train with multi-GPU

Alexey

2016-12-13 94641733ce521e5a44f3c9414f9797b77b34a31e

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classes=21842
train  = /data/imagenet/imagenet22k.train.list
valid  = /data/imagenet/imagenet22k.valid.list
backup = /home/pjreddie/backup/
labels = data/imagenet.labels.list
names  = data/imagenet.shortnames.list
top = 5