Added the calendar app

widget_vincentdjango/calendar/admin.py

+from django.contrib import admin
+
+# Register your models here.

widget_vincentdjango/calendar/apps.py

+from django.apps import AppConfig
+
+
+class CalendaConfig(AppConfig):
+    default_auto_field = 'django.db.models.BigAutoField'
+    name = 'calendar'

widget_vincentdjango/calendar/models.py

+from django.db import models
+
+# Create your models here.

widget_vincentdjango/calendar/tests.py

+from django.test import TestCase
+
+# Create your tests here.

widget_vincentdjango/calendar/views.py

+from django.shortcuts import render
+
+# Create your views here.