README.md: add notes to How to compile on Windows

Jud White

2018-03-25 c6ecf1e0420737eafeb99b27b1d716b46a6cbb7a

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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