Update README.md

Add information how to cite TensorFlow Model Garden

README.md

@@ -30,3 +30,18 @@ If you want to contribute, please review the [contribution guidelines](https://g
 ## License
 
 [Apache License 2.0](LICENSE)
+
+## Citing TensorFlow Model Garden
+
+If you use TensorFlow Model Garden in your research, please cite this repository.
+
+```
+@misc{tensorflowmodelgarden2020,
+  author = {Hongkun Yu and Chen Chen and Pengchong Jin and Xianzhi Du and 
+            Yeqing Li and Abdullah Rashwan and Le Hou and Fan Yang and
+            Frederick Liu and Jaeyoun Kim and Jing Li},
+  title = {TensorFlow Model Garden},
+  howpublished = {\url{https://github.com/tensorflow/models}},
+  year = {2020},
+}
+```