This is used in my two plugins - OctoPrint OneDrive Backup and OctoPrint OneDrive File Sync.
It is made for my own purposes to unify the code across the two plugins, making maintenance a bit easier. As such it has no documentation or stable API guarantees and I don't recommend you try and use it for your project.
It is hosted on PyPi and can be installed with pip:
pip install octo-onedrive