Get the repository via
git clone https://github.com/FelixMetzner/TemplateFitter
or
git clone git@github.com:FelixMetzner/TemplateFitter.git
and install the package with
cd TemplateFitter
pip3 install -e ./
which will also install the requirements.
A first, but not yet completed documentation can be found here