Adding screenshots to README

Author: tjackiw

README.md

@@ -5,6 +5,8 @@ JIRA Plugin for Graylog
 
 An alarm callback plugin that integrates [JIRA](https://www.atlassian.com/software/jira/) into [Graylog](https://www.graylog.org/).
 
+![](https://github.com/tjackiw/graylog-plugin-jira/blob/master/screenshot-jira.png)
+
 **Required Graylog version:** 1.0 and later
 
 ## Installation
@@ -22,6 +24,8 @@ Create a "JIRA Alarm Callback" on the "Manage alerts" page of your stream.
 Enter the requested configuration and save. 
 Make sure you also configured alert conditions for the stream so that the alerts are actually triggered.
 
+![](https://github.com/tjackiw/graylog-plugin-jira/blob/master/screenshot-alert.png)
+
 ## Build
 
 This project is using Maven and requires Java 7 or higher.