Add Celery Support

This needs to be tested on a linux host - windows not supported

api/api/__init__.py

@@ -0,0 +1,5 @@
+# This will make sure the app is always imported when
+# Django starts so that shared_task will use this app.
+from .celery import app as celery_app
+
+__all__ = ('celery_app',)

api/api/celery.py

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+import os
+
+from celery import Celery
+
+# Set the default Django settings module for the 'celery' program.
+os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'api.settings')
+
+app = Celery('api')
+
+
+# Using a string here means the worker doesn't have to serialize
+# the configuration object to child processes.
+# - namespace='CELERY' means all celery-related configuration keys
+#   should have a `CELERY_` prefix.
+app.config_from_object('django.conf:settings', namespace='CELERY')
+
+# Load task modules from all registered Django apps.
+app.autodiscover_tasks()
+
+
+@app.task(bind=True)
+def debug_task(self):
+    print(f'Request: {self.request!r}')

api/bills/tasks.py

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+### Celery Tasks!
+
+from celery import shared_task
+
+@shared_task
+def get_overdue_bills():
+    return('This is a test')