This project was a part of GSoC 2014. You could know more from following links:

1. Project Description: https://wiki.apertium.org/wiki/User:Pankajksharma/Patcher

2. Installation Directions: https://wiki.apertium.org/wiki/User:Pankajksharma/Patcher_Installation

3. API usage and algorithm used: https://wiki.apertium.org/wiki/User:Pankajksharma/Patcher

If you face any issue, contact 'sharmapankaj1992 (at) gmail (dot) com'