:handshake: Add flower to task queues section (#178)

* Add flower to task queues section

* :pencil: Update README.md

Co-authored-by: Jeff Triplett <jefftriplett@users.noreply.github.com>

README.md

@@ -240,6 +240,7 @@ _For a complete listing of all available packages, see [Django Packages](https:/
 - [django-rq](https://github.com/rq/django-rq) - Integration for Redis Queue.
 - [django-redis](https://github.com/niwinz/django-redis) - Full-featured Redis cache backend for Django.
 - [celery](https://github.com/celery/celery) - Robust and broker-agnostic task queues for bigger, performance-focused projects.
+- [flower](https://github.com/mher/flower) - Flower is a web-based tool for monitoring and administrating Celery clusters.
 - [django-celery-beat](https://github.com/celery/django-celery-beat) - A periodic task scheduler with database configured by Django's Admin Panel.
 - [celery-exporter](https://github.com/danihodovic/celery-exporter) - Prometheus & Grafana monitoring of Celery tasks.
 - [django-dramatiq](https://github.com/Bogdanp/django_dramatiq) - Task processing library with a focus on simplicity, reliability, and performance.