[license] Add License

.gitignore

.pre-commit-config.yaml

LICENSES/CC-BY-NC-SA-4.0.txt

README.md

config/morpher/lb_combined.yaml

config/morpher/lb_complete.yaml

config/morpher/mordiff.yaml

config/morpher/sg2_w+.yaml

config/morpher/sg2_w.yaml

config/single_morph.yaml

environment.yaml

notebooks/demo.ipynb

pyproject.toml

src/morphgen/__init__.py

src/morphgen/config/__init__.py

src/morphgen/config/morphers.py

src/morphgen/contrib/__init__.py

src/morphgen/morphing/__init__.py

src/morphgen/morphing/diffae.py

src/morphgen/morphing/lbm.py