A few bugs inside of pyDMFormFactor have been removed and a version of
the DirectDM Software, which is capable of symbolic computations with
SymEngine have been added. These two codes are combined in the webapp
based on streamlit.

This function calculates the eventrate for a given dark matter
distribution (only Maxwell-Boltzmann distribution available yet) and
returns the expected eventrate for a dark matter direct detection
experiment.

All exposed and most other functions have now docstrings, also I tried
to implement Python Enhancement Proposals (PEP) style guide.
Furthermore this module is now installable by pip, thanks to the
setup.py and requierements file. Moreover the README.md file has now
useful content.

The Code has been reorganized as a package and has been cleaned up a
little bit. Furthermore a few bugs in the Operators as well as in the
Coefficient class have been fixed. Also a lot more isotopes as
TargetIsotopes are available and their density matrices are put into the
program.
A little pytest class has also been written, as far as it is possible to
tell at this stage, it seems like all bugs have been fixed and the
package behaves the same way as the original mathematica script.
Documentation is still necessary

1:1 translation of the Mathematica-Script DMFormFactor to python.
A brief testing has been done to show that both codes lead to the same
results, but more testing is necessary.
Furthermore the possibility to connect this script directly to the
python package directdm is added at the very end.