added migration files

.gitignore

src/account/migrations/0003_auto_20200202_1541.py

src/account/migrations/0004_remove_profile_image.py

src/account/migrations/0005_auto_20200202_2058.py

src/account/migrations/0006_auto_20200202_2100.py

src/document/migrations/0001_initial.py

src/document/migrations/0006_auto_20200203_0016.py

src/groups/migrations/0001_initial.py

src/homework/migrations/0003_auto_20200202_1541.py

src/mentors/migrations/0001_initial.py

src/mentors/migrations/__init__.py

src/news/migrations/0002_auto_20200202_1541.py