Add donate options to README.md

README.md

@@ -1,7 +1,7 @@
 Smack
 =====
 
-[![Build Status](https://travis-ci.org/igniterealtime/Smack.svg?branch=master)](https://travis-ci.org/igniterealtime/Smack)  [![Project Stats](https://www.openhub.net/p/smackxmpp/widgets/project_thin_badge.gif)](https://www.openhub.net/p/smackxmpp)
+[![Build Status](https://travis-ci.org/igniterealtime/Smack.svg?branch=master)](https://travis-ci.org/igniterealtime/Smack)  [![Project Stats](https://www.openhub.net/p/smackxmpp/widgets/project_thin_badge.gif)](https://www.openhub.net/p/smackxmpp) [![Flattr this git repo](http://api.flattr.com/button/flattr-badge-large.png)](https://flattr.com/submit/auto?user_id=flowdalic&url=https://github.com/igniterealtime/Smack&title=Smack&language=&tags=github&category=software)
 
 About
 -----
@@ -52,6 +52,14 @@ Resources
 - Maven Releases: https://oss.sonatype.org/content/repositories/releases/org/igniterealtime/smack/
 - Maven Snapshots: https://oss.sonatype.org/content/repositories/snapshots/org/igniterealtime/smack/
 
+Donate
+------
+
+If you find Smack useful and feel like donating, then you can use one of the following systems:
+
+- [Donate via Flattr](https://flattr.com/thing/d7b3aa1146d7542921816c4ed057683e)
+- Donate via Bitcoin: 1D4k11bsPxRB6rS51fxDty8QYfRVUt5JMB
+
 Ignite Realtime
 ===============