Just clone repo and run pip install -r requirements.txt.
If you want you can activate a virtual environment for clean development (you need to install python-venv):
python -m venv <name_of_virtual_enviroment>
To activate -> source <name_of_virtual_enviroment>/bin/activate, to exit -> deactivate.
Must download lang model:
python -m spacy download de_core_news_sm