Update Readme.md - Custom object training

Alexey

2017-01-11 0c30a743bd51846727447b633a4d545e8944958f

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classes= 20
train  = /home/pjreddie/data/voc/train.txt
valid  = /home/pjreddie/data/voc/2007_test.txt
names = data/voc.names
backup = /home/pjreddie/backup/