add missing Introduction (#140)

configs/localization/bmn/README.md

 # BMN
 
+## Introduction
+```
+@inproceedings{lin2019bmn,
+  title={Bmn: Boundary-matching network for temporal action proposal generation},
+  author={Lin, Tianwei and Liu, Xiao and Li, Xin and Ding, Errui and Wen, Shilei},
+  booktitle={Proceedings of the IEEE International Conference on Computer Vision},
+  pages={3889--3898},
+  year={2019}
+}
+```
+
 ## Model Zoo
 
 ### ActivityNet feature

configs/localization/bsn/README.md

 # BSN
 
+## Introduction
+```
+@inproceedings{lin2018bsn,
+  title={Bsn: Boundary sensitive network for temporal action proposal generation},
+  author={Lin, Tianwei and Zhao, Xu and Su, Haisheng and Wang, Chongjing and Yang, Ming},
+  booktitle={Proceedings of the European Conference on Computer Vision (ECCV)},
+  pages={3--19},
+  year={2018}
+}
+```
+
 ## Model Zoo
 
 ### ActivityNet feature

configs/recognition/csn/README.md

@@ -10,6 +10,14 @@ pages = {5551-5560},
 title = {Video Classification With Channel-Separated Convolutional Networks},
 doi = {10.1109/ICCV.2019.00565}
 }
+
+@inproceedings{ghadiyaram2019large,
+  title={Large-scale weakly-supervised pre-training for video action recognition},
+  author={Ghadiyaram, Deepti and Tran, Du and Mahajan, Dhruv},
+  booktitle={Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition},
+  pages={12046--12055},
+  year={2019}
+}
 ```
 
 ## Model Zoo

configs/recognition/r2plus1d/README.md

 # R2plus1D
 
+## Introduction
+```
+@inproceedings{tran2018closer,
+  title={A closer look at spatiotemporal convolutions for action recognition},
+  author={Tran, Du and Wang, Heng and Torresani, Lorenzo and Ray, Jamie and LeCun, Yann and Paluri, Manohar},
+  booktitle={Proceedings of the IEEE conference on Computer Vision and Pattern Recognition},
+  pages={6450--6459},
+  year={2018}
+}
+```
+
 ## Model Zoo
 
 ### Kinetics-400

configs/recognition/slowfast/README.md

 # SlowFast
 
+## Introduction
+```
+@inproceedings{feichtenhofer2019slowfast,
+  title={Slowfast networks for video recognition},
+  author={Feichtenhofer, Christoph and Fan, Haoqi and Malik, Jitendra and He, Kaiming},
+  booktitle={Proceedings of the IEEE international conference on computer vision},
+  pages={6202--6211},
+  year={2019}
+}
+```
+
 ## Model Zoo
 
 ### Kinetics-400

configs/recognition/slowonly/README.md

 # SlowOnly
 
+## Introduction
+```
+@inproceedings{feichtenhofer2019slowfast,
+  title={Slowfast networks for video recognition},
+  author={Feichtenhofer, Christoph and Fan, Haoqi and Malik, Jitendra and He, Kaiming},
+  booktitle={Proceedings of the IEEE international conference on computer vision},
+  pages={6202--6211},
+  year={2019}
+}
+```
+
 ## Model Zoo
 
 ### Kinetics-400

configs/recognition/tsn/README.md

 # TSN
 
+## Introduction
+```
+@inproceedings{wang2016temporal,
+  title={Temporal segment networks: Towards good practices for deep action recognition},
+  author={Wang, Limin and Xiong, Yuanjun and Wang, Zhe and Qiao, Yu and Lin, Dahua and Tang, Xiaoou and Van Gool, Luc},
+  booktitle={European conference on computer vision},
+  pages={20--36},
+  year={2016},
+  organization={Springer}
+}
+```
+
 ## Model Zoo
 
 ### UCF-101