Add any issues you know about - or todo's you have to the projects Issues in github. Add "help wanted" and "good first issue" labels to these issue, as appropriate. Add a "Contributing" section to the README to help new contributors get started, pointing to https://github.com/Roznoshchik/Lurnby/issues?q=is%3Aopen+is%...
What's your plan with lurnby.com?