Added License, delete old files, update README

.gitlab-ci.yml

CONTRIBUTING.md

LICENSE

README.md

build_and_test.sh

docs/Makefile

docs/make.bat

docs/source/_static/css/my_theme.css

docs/source/conf.py

docs/source/index.rst

literature/.gitkeep

...rature/STRUPHY_Hybrid_kinetic_MHD_26062020_compressed.pdf

logs/.gitignore

notebooks/absB.png

notebooks/det_df.png

notebooks/dtheta.png

notebooks/poloidal.png

notebooks/pressure.png

notebooks/profiles.png

notebooks/topview.png