Added Lavagna as a project management tool

README.md

@@ -801,7 +801,7 @@ See also [Ticketing](#ticketing), [Task management/To-do lists](#task-management
   * [The Bug Genie](http://www.thebuggenie.com/) - Written in PHP.
   * [Trac](http://trac.edgewall.org/) - Written in python.
   * [Phproject](http://www.phproject.org/) - A high performance full-featured project management system. ([Demo](http://demo.phproject.org/), [Source Code](https://github.com/Alanaktion/phproject)) `GPLv3`
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+  * [Lavagna](http://lavagna.io) - Lavagna is an open-source issue/project management tool designed for small teams. Lightweight, pure Java, easy to install, easy to use. ([Source Code](https://github.com/digitalfondue/lavagna)) `GPLv3` `Java`
 
 ### Bug Trackers