First of all thanks for your interest in willing to contribute to AirspaceConverter!
Reporting bugs should be done preferably creating a new issue on GitHub. It's essential that the problem occurred should be really well documented so please attach logs, output, crash dumps and screenshots. Alternatively a bug can be reported also writing to admin@alus.it
Also new features should be requested preferably using the issues page on GitHub of this project.
If you wish to contribute adding your implementations you are really welcome! Just submit your pull request and it will be evaluated to be merged. Please remember to explain and motivate your changes (where necessary). Every change resulting as improvement will be certainly merged!