finish data structure, make views

.gitignore

groups/admin.py

groups/apps.py

groups/models.py

lectures/admin.py

lectures/apps.py

lectures/migrations/0001_initial.py

...rematerial_rename_event_lecturelector_lecture_and_more.py

...es/migrations/0003_alter_lecturematerial_file_and_more.py

...es/migrations/0004_alter_lecturematerial_file_and_more.py

lectures/migrations/0005_lecturegroup.py

...es/migrations/0006_alter_lecturegroup_options_and_more.py

lectures/migrations/0007_alter_lecture_options.py

lectures/migrations/0008_alter_lecture_options.py

...tions/0009_remove_lecturegroup_lectures_lecture_groups.py

lectures/migrations/0010_alter_lecturegroup_options.py

lectures/models.py

lectures/templates/lectures/index.html

lectures/urls.py

lectures/views.py