Read.me update

README.md

@@ -1,3 +1,14 @@
 ---
 license: apache-2.0
 ---
+
+if you find this datset useful and use it in your work please cite:
+
+@inproceedings{wu2021flagdetseg,
+  title={FlagDetSeg: Multi-nation flag detection and segmentation in the wild},
+  author={Wu, Shou-Fang and Chang, Ming-Ching and Lyu, Siwei and Wong, Cheng-Shih and Pandey, Abhineet Kumar and Su, Po-Chi},
+  booktitle={2021 17th IEEE International Conference on Advanced Video and Signal Based Surveillance (AVSS)},
+  pages={1--8},
+  year={2021},
+  organization={IEEE}
+}