Banana depends on various 3rd party Python libraries which are defined in the requirements.txt file. You can install the dependencies using pip:
$ pip install astropy
$ pip install -r requirements.txt
Pip cant figure out dependencies correctly in some cases, so you need to manually install astropy first.
copy the example config file:
$ cp project/settings/local_example.py project/settings/local.py
Now open project.settings.local
in your favorite editor and configure your database settings.
You can run a Django testing webserver serving the banana project using:
$ ./manage.py runserver
If you want a more permanent implementation and serve Banana so several users it is adviced to deploy your setup with a dedicated webserver. The Django project itself has extended documentation on how to do this.