Added arxiv info to readme.

README.md

@@ -7,16 +7,20 @@
 ### Overview
 
 This directory contains code necessary to run the GraphSAGE algorithm.
-<!---
 See our [paper](http://TODO) for details on the algorithm.
---->
+
 The example_data subdirectory contains a small example of the PPI data,
 which includes 3 training networks + one validation network and one test network.
 The full Reddit and PPI datasets are available on the [project website](http://snap.stanford.edu/graphsage/).
 
-<!---
 If you make use of this code or the GraphSAGE algorithm in your work, please cite the following paper: 
---->
+
+     @article{hamilton2017inductive,
+	     author = {Hamilton, William L. and Ying, Rex and Leskovec, Jure},
+	     title = {Inductive Representation Learning on Large Graphs},
+	     journal = {arXiv preprint, arXiv:1603.04467},
+	     year = {2017}
+	   }
 
 ### Requirements