Actually, its not as easy as it seems. Check this link for more info: Deploying your notebook as an app under 10 minutes
Although Butch from our study group put a nice guide here: https://github.com/butchland/fastai-binder-app-template
Basically you have to export your learning model to export.pkl file and download this, along with your minimal version of your notebook (details in above link)
Then you have to push this to a new repo in github and get it working via binder.
Hope that helps