Reorganize the repository and make it a python package.

CHANGELOG.md

README.md

examples/OPA-simulation.py

examples/lnbVsAgs-example.py

examples/plots/.gitkeep

examples/results/.gitkeep

examples/upconversion.py

pyproject.toml

snlo-helper/__init__.py

snlo_helper.egg-info/PKG-INFO

snlo_helper.egg-info/SOURCES.txt

snlo_helper.egg-info/dependency_links.txt

snlo_helper.egg-info/requires.txt

snlo_helper.egg-info/top_level.txt

snlohelper/__init__.py

snlohelper/get_spectr.py

snlohelper/snlohelper.py