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

Jud White

2018-03-25 c6ecf1e0420737eafeb99b27b1d716b46a6cbb7a

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classes= 80
train  = data/coco/trainvalno5k.txt
valid  = data/coco_testdev
#valid = data/coco_val_5k.list
names = data/coco.names
backup = backup/
eval=coco