Update README.md

Author: YingtongDou

README.md

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-# Graph Adversarial Learning Literature
+<div align="center">
+    <h1>Awesome Graph Adversarial Learning Literature</h1>
+    <a href="https://awesome.re"><img src="https://awesome.re/badge.svg"/></a>
+    <a href="http://makeapullrequest.com"><img src="https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat-square"/></a>
+</div>
 
-[![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat-square)](http://makeapullrequest.com)
-
-A curated list of adversarial attacks and defenses papers on graph-structured data.
+A curated list of adversarial attacks and defenses papers on graph-structured data. 
 
 Papers are sorted by their uploaded dates in descending order.
 
+If you want to add new entries, please make PRs with the same format.
+
 This list serves as a complement to the survey below.
 
 [**Adversarial Attack and Defense on Graph Data: A Survey** ](https://arxiv.org/abs/1812.10528) **(Updated in Oct 2022. More than 110 papers reviewed).**