Update README.md

mrkm4ntr · web-flow · commit 2b5ef92c39d9 · 2017-12-09T20:03:43.000+09:00
diff --git a/README.md b/README.md
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 This plugin provides network graph for [GitBucket](https://github.com/gitbucket/gitbucket).
 
+![Screenshot](https://github.com/mrkm4ntr/gitbucket-network-plugin/blob/img/readme.png)
+
 ## Installation
 
 Download jar file from [the release page](https://github.com/mrkm4ntr/gitbucket-network-plugin/releases) and put into `GITBUCKET_HOME/plugins`.
