Object detection, add "SSD: Single Shot MultiBox Detector"

Paper : https://arxiv.org/pdf/1512.02325v2.pdf
Code :
* https://github.com/weiliu89/caffe/tree/ssd
* https://github.com/zhreshold/mxnet-ssd

README.md

@@ -90,6 +90,9 @@ Please feel free to [pull requests](https://github.com/kjw0612/awesome-deep-visi
 * Weakly Supervised Object Localization with Multi-fold Multiple Instance Learning [[Paper](http://arxiv.org/pdf/1503.00949.pdf)]
 * R-FCN [[Paper]](https://arxiv.org/abs/1605.06409) [[Code]](https://github.com/daijifeng001/R-FCN)
   * Jifeng Dai, Yi Li, Kaiming He, Jian Sun, R-FCN: Object Detection via Region-based Fully Convolutional Networks
+* SSD [[Paper]](https://arxiv.org/pdf/1512.02325v2.pdf) [[Code]](https://github.com/weiliu89/caffe/tree/ssd)
+  * Wei Liu1, Dragomir Anguelov, Dumitru Erhan, Christian Szegedy, Scott Reed, Cheng-Yang Fu, Alexander C. Berg, SSD: Single Shot MultiBox Detector, arXiv:1512.02325
+
 
 ### Video Classification
 * Nicolas Ballas, Li Yao, Pal Chris, Aaron Courville, "Delving Deeper into Convolutional Networks for Learning Video Representations", ICLR 2016. [[Paper](http://arxiv.org/pdf/1511.06432v4.pdf)]