add lecture models

.gitignore

groups/__init__.py

groups/admin.py

groups/apps.py

groups/migrations/__init__.py

groups/models.py

groups/tests.py

groups/views.py

lectures/__init__.py

lectures/admin.py

lectures/apps.py

lectures/migrations/0001_initial.py

lectures/migrations/__init__.py

lectures/models.py

lectures/tests.py

lectures/views.py

requirements/base.txt

shared/static/shared/base.js

shared/static/shared/runtime.js

shared/static/shared/style.css