Made migrations for newly populated models.py and implemented admin.py; migrated models and tested runserver to check for errors

Added model field reference in the README.txt file and implemented widget_calendar models.py and admin.py

Initialized widget_calendar branch in git and gitlab, and completed information found in README.txt, including names and signatures of all members

Finished setting up the project by starting apps, modifying their urls.py files, and making migrations and testing runserver