update README.md

Author: kentechx

README.md

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+<img src="./pointnet.jpg" width="1200px"></img>
 # pointnet
 A pytorch implementation of PointNet
+
+## References
+```bibtex
+@article{qi2017pointnet,
+  title={Pointnet: Deep learning on point sets for 3d classification and segmentation},
+  author={Qi, Charles R and Su, Hao and Mo, Kaichun and Guibas, Leonidas J},
+  booktitle={Proceedings of the IEEE conference on computer vision and pattern recognition},
+  year={2017}
+}
+```