update README.md

Author: jasonlovescoding

README.md

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 # YOLOv3-pytorch
 A YOLOv3 model in pytorch0.4.1
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+usage: 
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+python detect_one.py --image=images/dog-cycle-car.png --cuda
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+### Acknowledgements
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+[Original tech report of YOLOv3 by Joseph Redmon](https://pjreddie.com/media/files/papers/YOLOv3.pdf)
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+Inspired by [Ayoosh Kathuria](https://github.com/ayooshkathuria)'s amazing tutorial on YOLOv3 implementation in pytorch,
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+I transformed the model into caffe and implemented a simple [caffe-based yolov3 workflow](https://github.com/jasonlovescoding/YOLOv3-caffe).
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+This project is its pytorch adaptation.
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+The weight files can be downloaded from [YOLOv3-pytorch](https://download.csdn.net/download/jason_ranger/10654561).
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+For people outside China, you can download from googledrive [YOLOv3-pytorch](https://drive.google.com/open?id=1T3oDa5iUH-yJ3VltgqN9wiZNzXb9hAdX)
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+### Notes
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+A simplest YOLOv3 model in pytorch0.4.1
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+This is merely a practice project. I re-implemented the darknet file for readability and 
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+make modification on the architecture for fine-tuning or transfer-learning easy, which is the main purpose of this project.